How to Find Hard to Find Suspension Parts for a 1970 Riviera

If you own a 1970 Buick Riviera, you know it’s a stunning car with a unique personality. But when it comes to suspension parts, that distinctiveness can become a headache. Many components are discontinued, and even reproduction parts can be scarce. This guide covers the hardest-to-find parts, where to look, and how to make informed choices without wasting time or money.

Understanding the 1970 Riviera Suspension

The 1970 Riviera rode on a perimeter frame with an independent front suspension using A-arms, coil springs, and a sway bar. The rear used a live axle with coil springs and control arms. Buick used many unique parts that don’t interchange with other GM models, which is why finding replacements can be a challenge.

Key Hard-to-Find Components

• Front Upper Control Arm Bushings: The upper control arm uses a specific bushing that often cracks with age. NOS (New Old Stock) is rare, and aftermarket polyurethane sets may require modification.
• Rear Coil Springs: The Riviera’s rear springs are a unique rate and length. Common aftermarket springs are often too stiff or soft, leading to a poor ride.
• Front Sway Bar Bushings and Links: The factory sway bar is thicker than most, and the brackets and bushings are notoriously hard to source.
• Steering Knuckles: The knuckles are Riviera-specific and prone to wear at the ball joint taper. Rebuildable cores are getting scarce.
• Ball Joints: Lower ball joints are shared with some other GM cars, but uppers are unique and often only available through specialty vendors.

Where to Start Your Search

Specialty Buick and Classic Buick Parts Retailers

Your best bet is a dedicated Buick parts supplier. They often carry hard-to-find items or can point you to NOS sources. Look for companies that have been in business for decades and have a reputation for accurate inventory.

Online Buick Forums and Owner Groups

The Buick community is active. Join forums like Riviera Owners Association or Buick General Discussion. Members often sell parts from parts cars or know where to find them. Post an ISO (In Search Of) ad with your specific needs.

Classic Car Salvage Yards

Salvage yards that specialize in 1960s-1970s GM cars are gold mines. You can search on sites like Car-Part.com for yards that list Riviera suspension parts. Always call ahead to verify condition and get photos.

Aftermarket Alternatives

Some suspension parts are available as aftermarket upgrades. For example, you can replace rubber bushings with polyurethane, but note that stiffness increases. For rear springs, aftermarket manufacturers like Eaton Detroit Spring can custom-wind springs to factory specs, but expect a lead time and higher cost.

Evaluating Part Quality and Fit

When you find a part, check its originality and condition. NOS parts can be brittle from age, so inspect for cracks or dry rot. Aftermarket parts often require slight modifications—file down a bushing or use a different size bolt. Always compare with your old part before installing.

Practical Tips for Sourcing

• Know Your Car’s Build Date: Parts changed slightly during the model year. Have your VIN or build sheet handy.
• Check Interchange: Some parts from 1969 and 1971 Rivieras may fit, but confirm with a reliable source. The rear axle is different by year.
• Use Part Numbers: Original GM part numbers help when searching online databases or calling suppliers. You can find them in factory manuals or online parts lists.
• Consider Rebuilding: If you have a good core, many components like ball joints can be rebuilt by specialists. This is often cheaper than searching for NOS.

Common Pitfalls to Avoid

• Assuming aftermarket fits without modification: Many “universal” parts require extra work. Don’t order without checking compatibility.
• Buying used parts without inspection: Rusted or bent parts are more trouble than they’re worth. Always ask for close-ups.
• Ignoring the rubber components: Even if you find metal parts, the bushings, bump stops, and insulators may be missing or worn. Budget for those too.

Final Recommendation

For the 1970 Riviera owner, the most reliable path is a combination of dedicated Buick parts suppliers and community networks. Start with a list of exactly what you need, including part numbers if possible. Then check with specialists like CARS Inc. (Old Buick Parts) or OPGI (though Riviera specific stock varies). Post in Riviera forums and call a few salvage yards. Be prepared to wait for rare items, and consider rebuilding or upgrading when NOS is too difficult or expensive. With patience and persistence, you can restore your Riviera’s suspension to proper form.