1. Interior Light Assemblies To Buy
  2. sku: 27125112198968983
  3. MG 158-940

MG 158-940 Mgb Trunk Lamp Light

fits year: 1971–1980.

158-940 Mg Mgb Trunk Lamp Light Assembly Original 1971-1980 Rare

( Brand: Mg ), ( Manufacturer Part Number: 158-940 ), ( Light Color: Warm White ), ( Mounting Style: Screws ), ( Items Included: Bulbs ), ( Vintage Part: Yes ), ( Placement On Vehicle: Trunk ), ( Type: Trunk Light Assembly ), ( Manufacturer Warranty: 1 Month ), ( Voltage: 12 V ), ( Housing Color: Black ), ( Features: Capa-certified, Dot-certified, Iso-certified, Oe-certified, Sae-certified ), ( Lens Color: Smoke/tinted ), ( Universal Fitment: No ), ( Finish: Textured ), ( Country Of Origin: United Kingdom ), ( Lighting Technology: Halogen )

Review MG Mgb Trunk Lamp Light Assembly Original Rare fits 1971–1980

The **1971 1980 Ford Mustang (158-940 MG B Trunk Lamp Light)** is a meticulously crafted, high-quality aftermarket replacement part designed to restore or enhance the classic aesthetic and functionality of your Mustang s trunk area. This trunk lamp light is a direct-fit solution, meticulously engineered to match the original specifications of the 1971 through 1980 Ford Mustang models, ensuring a seamless integration with the vehicle s iconic design. Crafted from durable, high-impact plastic, the lamp housing is built to withstand the rigors of daily use while maintaining a vintage appearance that complements the muscle car s timeless appeal. The lens is precision-molded to replicate the original translucent amber or clear finish, depending on the model year and configuration, allowing for optimal light diffusion while preserving the authentic look of the factory installation. Inside, a robust and reliable incandescent bulb socket is included, accommodating standard medium-base bulbs (typically a 12V, 21/25W bulb) that provide bright, even illumination for visibility when accessing the trunk. The mounting bracket is designed with precision, featuring the correct spacing and alignment to fit securely into the trunk lid s designated housing, ensuring a snug and stable fit without the need for modifications. Whether you re restoring a show-quality Mustang or simply maintaining the integrity of your daily driver, this trunk lamp light delivers both form and function, blending seamlessly with the vehicle s heritage while ensuring reliable performance. Perfect for collectors, enthusiasts, and restorers alike, it s an essential component for achieving that authentic, factory-fresh look that defines the golden era of American muscle cars.

### Pros and Cons of Buying a 158-940 mgb Trunk Lamp (1971-1980)

#### **Pros:**

1. **Functionality and Practicality** The trunk lamp provides essential illumination when opening the rear hatch, improving visibility and safety, especially in low-light conditions. This is particularly useful for older cars where modern lighting systems may not be retrofittable or practical.

2. **Nostalgia and Authenticity** For enthusiasts of the classic MG B series (1971 1980), restoring or maintaining period-correct lighting enhances the car s authenticity. This attention to detail appeals to purists who value historical accuracy.

3. **Compatibility with Vintage Wiring** The wiring and electrical system in these cars are often simpler than modern vehicles, making it easier to install or replace a trunk lamp without complex diagnostics. The 158-940 model is designed to fit seamlessly into the original wiring harness.

4. **Cost-Effective Upgrade** Compared to replacing or retrofitting modern lighting solutions, a vintage trunk lamp is relatively inexpensive. It avoids the need for additional modifications or adaptations to the car s electrical system.

5. **Durability and Longevity** High-quality vintage bulbs and components are often built to last, especially if sourced from reputable suppliers. With proper care, the lamp can function reliably for years without frequent replacements.

6. **Aesthetic Appeal** The classic design of the MG B s trunk lamp contributes to the car s vintage charm. Restoring or replacing it with an original or well-matched aftermarket part preserves the car s aesthetic integrity.

7. **Ease of Installation** Many trunk lamps from this era are designed for straightforward installation, requiring minimal tools and technical skill. The 158-940 model is known for its plug-and-play compatibility with the original wiring.

8. **Support for Classic Car Communities** Owning and maintaining a vintage MG B often means being part of a community that values restoration and preservation. Using period-correct parts like the trunk lamp fosters engagement with like-minded enthusiasts.

---

#### **Cons:**

1. **Limited Availability of Parts** Finding an exact replacement for the 158-940 trunk lamp may be challenging, especially if the supplier is no longer in business. Some aftermarket parts may not perfectly match the original design, leading to slight discrepancies in fit or function.

2. **Bulb Compatibility Issues** The original bulbs used in these lamps (often incandescent or early halogen types) may not be as energy-efficient or long-lasting as modern alternatives. Additionally, some bulbs may be discontinued, requiring special ordering or substitutions.

3. **Potential for Electrical Wear** Older wiring harnesses or connectors in the trunk area may be prone to corrosion or damage over time. If the wiring is degraded, the trunk lamp may not function properly, requiring additional repairs to the electrical system.

4. **Brightness and Modern Standards** The illumination provided by vintage trunk lamps may be dimmer than modern equivalents, which could be a safety concern in poorly lit areas. Some owners may prefer brighter, more contemporary lighting solutions.

5. **Cost of Restoration** While the lamp itself is inexpensive, restoring the surrounding area (e.g., cleaning or replacing corroded connectors, repainting the trunk interior) can add to the overall cost. This may not be feasible for budget-conscious owners.

6. **Compatibility with Aftermarket Modifications** If the car has undergone significant modifications (e.g., custom wiring, LED retrofits, or trunk liners), the original trunk lamp may not integrate seamlessly. This could require additional work to adapt it to the modified setup.

7. **Risk of Counterfeit or Low-Quality Parts** Purchasing from untrusted suppliers may result in receiving replica parts that do not match the original specifications. This could lead to poor performance, fit issues, or premature failure.

8. **Maintenance Requirements** Vintage electrical components may require periodic maintenance, such as cleaning contacts or replacing worn-out wiring. Neglecting these tasks could lead to intermittent functionality or complete failure of the trunk lamp.

---

### **Conclusion:**

Buying a 158-940 mgb trunk lamp for a 1971 1980 MG B is a practical and often rewarding choice for enthusiasts who prioritize authenticity, simplicity, and historical accuracy. The pros such as ease of installation, compatibility with vintage systems, and the preservation of classic aesthetics outweigh the cons for most owners who are committed to maintaining their car s original character. However, the cons, particularly those related to part availability, electrical reliability, and modern safety standards, should be carefully considered.

For those who value the car s heritage and are willing to invest time in maintenance, the trunk lamp is a worthwhile addition. Conversely, owners who prioritize brightness, modern convenience, or have heavily modified their cars may find that a contemporary alternative (e.g., LED retrofits) is more suitable.

---

### **Recommendation:**

If you are restoring or maintaining an original MG B and seek a period-correct solution, purchasing the **158-940 trunk lamp** is highly recommended. Ensure you source it from a reputable supplier (such as classic car specialty shops or trusted online retailers) to guarantee authenticity and quality. Pair this with a check of the car s wiring and connectors to address any potential electrical issues that could affect performance.

For owners who prefer brighter lighting or have modified their cars extensively, consider consulting with a classic car electrician to explore retrofitting modern alternatives while preserving the car s vintage feel where possible. Ultimately, the decision should align with your priorities whether that be strict authenticity, practicality, or a blend of both.

Details:

Most cars out there are missing these or they broken. This is not a cheap reproduction. This is a rare original trunk lamp light assembly with harness for all MG MGB roadster model's 1971-1980.

part #: 158940 prices

  • $10.00-$22.00

specifications interiorlightsot:

  • for years: 1971-1980
  • brand: Mg
  • mpn: 158-940
  • light color: Warm White
  • mounting style: Screws
  • items included: Bulbs
  • vintage part: Yes
  • placement on vehicle: Trunk
  • type: Trunk Light Assembly
  • manufacturer warranty: 1 Month
  • voltage: 12 V
  • housing color: Black
  • features: Capa-certified, Dot-certified, Iso-certified, Oe-certified, Sae-certified
  • lens color: Smoke/tinted
  • universal fitment: No
  • finish: Textured
  • country of origin: United Kingdom
  • lighting technology: Halogen

seller interiorlightsot:

  • # reviews: 2368
  • rating: 99.6%
  • city: Birmingham, Alabama

general interiorlightsot:

  • condition: Used
  • Car Truck Parts Accessories > Lighting Lamps > Interior Light Assemblies

payments interiorlightsot:

  • credit card: Diners-club
  • check
  • money order
  • other
  • wallet: Paypal
  • cash

offer interiorlightsot:

  • quantity: 2
  • options: Ship-to-home
  • availability: In Stock
  • started: April 10, 2026
  • sold: 0

returns interiorlightsot:

  • time: 30 Days
  • policy: Returns Accepted
  • paid by: Seller

shipping interiorlightsot:

  • transit: 5-11 Days
  • class: Standard, Expedited
  • service: USPS Ground Advantage, USPS Priority Mail
  • type: Fixed
  • cost: $8.70
  • carrier: USPS
for years: 1971-1980, light color: warm white, mounting style: screws, items included: bulbs, vintage part: yes, placement on vehicle: trunk, type: trunk light assembly, manufacturer warranty: 1 month, voltage: 12 v, housing color: black, features: capa-certified, dot-certified, iso-certified, oe-certified, sae-certified, lens color: smoke/tinted, universal fitment: no, finish: textured, country of origin: united kingdom, lighting technology: halogen,
category: auto parts > car truck parts accessories > lighting lamps > interior light assemblies, sku: 27125112198968983,
Mg 158-940 Is Similar To:
interiorlightsot logo
2 offers $10.00–$22.00 USD
  • Used. Offer #1 priced at $10.00 + $6.07 shipping estimate = $16.07* total. SIMILAR TO MOSS , USED? NOT CLEAR HOW CONNECTION IS MADE ON ONE END. UP FOR SALE: MG MIDGET, TRUNK LAMP.+$6.07 shipping
  • Used. Offer #2 priced at $22.00 + $8.70 shipping estimate = $30.70* total. Most cars out there are missing these or they are broken. This is not a cheap reproduction.+$8.70 shipping

Copyright © interiorlightsot.com