Buick Roadmaster Trunk Lock: A Guide for the 1958 and 1991 Models
Secure your classic Buick's trunk by understanding the differences in replacement locks between the distinct 1958 and 1991 model years.
- Verify your exact model year (1958 vs. 1991) before ordering, as the parts are completely different.
- New aftermarket locks from a reputable brand like Standard Ignition are the most practical and reliable option.
- A new lock will come with new keys; a locksmith is needed to re-key the new lock to match your car's original keys.
- Symptoms like a trunk not opening may be caused by the latch or linkage, not just the lock cylinder.
Understanding Your Roadmaster's Trunk Lock
When shopping for a new trunk lock for a 1958-1991 Buick Roadmaster, it is critical to know that you are dealing with two completely different vehicles. The Roadmaster name was used until 1958 and then revived in 1991. The parts are not interchangeable. The 1958 model uses a simple, mechanical lock cylinder and handle assembly typical of 1950s GM cars. The 1991 model, part of the GM B-body family, uses a more modern assembly that may include an electric actuator for remote unlatching.
Order the Correct Part for Your Year
Before purchasing, double-check that the lock is specified for either the 1958 models or the 1991-1996 generation. Aftermarket suppliers sometimes group these distinct generations under one heading, which can be confusing. A lock for a 1991 model will not fit a 1958, and vice versa.
Choosing a Quality Aftermarket Trunk Lock
For vehicles of this age, finding new original equipment (OEM) parts is nearly impossible. The most common option is a new aftermarket part. Standard Ignition (also known as Standard Motor Products or SMP) is a widely available and reputable brand that manufactures replacement trunk locks for both the 1958 and 1991-1996 Roadmaster models. They are known for producing quality components that meet or exceed original specifications, using materials like solid brass for tumblers to ensure smooth operation.
Brand Focus: Standard Ignition
Standard Ignition is a trusted name in the aftermarket industry with over a century of experience. Their lock cylinders are designed to be direct-fit replacements, which simplifies installation. While some user reviews for their ignition locks mention occasional stiffness, the brand is generally well-regarded by professional technicians for its reliability and precision manufacturing. When you can't find an original part, a high-quality aftermarket lock from a brand like Standard Ignition is a dependable choice.
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket (Standard Ignition) | $14.75 - $23.31 |
| Used OEM | $25 - $75+ (Varies widely by condition and source) |
| New OEM (NOS) | Extremely rare and costly, if found |
| Shop Labor for Installation | $95 - $150 |
Frequently Asked Questions
Will my original key work with the new trunk lock?
No. A new aftermarket trunk lock will come with its own set of keys. If you want to use your original ignition key for the trunk, you will need to take the new lock and your original key to a locksmith to have the new lock re-pinned.
🎬 Watch this guide on how to re-key classic car locks.Is replacing the trunk lock a difficult job?
For most DIY mechanics, this is a relatively easy job. It typically involves removing an inner trunk lid panel to access the lock's retaining clips 🎬 See how to remove a GM trunk lock without special tools. and linkage rods. The entire process usually takes less than an hour with basic hand tools.
My key turns, but the trunk won't open. Is the lock broken?
Not necessarily. On the 1991 model, this could be a problem with the latch mechanism itself, a disconnected linkage rod between the lock cylinder and the latch, or a failed electric actuator. For the 1958 model, it's likely a disconnected or broken mechanical linkage. It's important to inspect the entire system before assuming the lock cylinder is the only problem.
🎬 Learn how to open a stuck Roadmaster trunk lid.Are there any recalls for the Buick Roadmaster trunk lock?
No. Searches of the National Highway Traffic Safety Administration (NHTSA) database show several recalls for the 1991-1996 Roadmaster generation, but none are related to the trunk lock mechanism. There are no TSBs (Technical Service Bulletins) for this specific issue, though unrelated TSBs exist for other models with trunk opening problems.
Helpful Videos
Technical Specifications
OEM Part Numbers: 19179680
The primary difference is the vehicle generation. The 1958 Roadmaster uses a fully mechanical lock system. The 1991 Roadmaster uses a lock cylinder that can be integrated with an electric trunk release actuator. Aftermarket parts are available for both distinct generations.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.