Buy 2006 Toyota Avalon Coil Spring Damper (Rear). Sienna. Suspension Coil Spring - Repair or Replace Suspension, Make - OEM Toyota Part # 4834108020 (48341-08020, 4834108010)

Damper. Spring. Bumper.
A component (mounted in the center of the Spring) which cushions the Spring as it is compressed. Coil. CUSHION. Dynamic. Stopper.

Coil Spring Damper

Fits Sienna

Sienna.
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 2006 Toyota Avalon might benefit from replacing the strut springs. Excessive rust can make the springs more prone to failure. Contact your local Toyota service department to have your suspension system evaluated.