Buy OEM Volvo Part # 32329003. Coil Spring (Rear). Variant code: AG02 and RA03. Variant code: RA03. Variant code: RA03. Suspension Coil Spring Your coil springs are

Suspension, Coil Spring and Torsion Spring.
Coil Spring.

REAR SPRING

Variant code: AG02 and RA03. Variant code: RA03. Variant code: RA03.
Suspension Coil Spring
Your coil springs are not especially prone to failure, but if they have been cut, clamped, or heated to have the vehicle lowered, your Volvo might benefit from replacing the strut springs. Excessive rust can make the springs more prone to failure. Contact your local Volvo service department to have your suspension system evaluated.