Buy OEM 1991 Buick Part # 20774890 (25783600). Coil Spring (Rear). Code:(YB). STS; Code 8YB, 9YB. Suspension Coil Spring - Repair or Replace Your coil springs are not especially

Coil Spring. Spring -.
Code-8YB,9YB. Coil Spring.

Coil Spring

Fits STS

Code:(YB). STS; Code 8YB, 9YB.
Suspension Coil Spring - Repair or Replace
Your coil springs are not especially prone to failure, but if they have been cut, clamped, or heated to have the vehicle lowered, your 1991 Buick might benefit from replacing the strut springs. Excessive rust can make the springs more prone to failure. Contact your local Buick service department to have your suspension system evaluated.