Buy Audi A5 Coil Spring Damper. TT; 2.0L; w/Sport Suspension; w/TTS Model. TT; 2.5L; w/o Sport Suspension, TT, Springs - OEM Audi Part # 8J0511353A (8J0-511-353-A)

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

Coil Spring Damper

Fits TT, TT RS

TT; 2.0L; w/Sport Suspension; w/TTS Model. TT; 2.5L; w/o Sport Suspension. W/AWD, w/o ride control suspension, w/o sport suspension, w/TT RS.
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 Audi A5 might benefit from replacing the strut springs. Excessive rust can make the springs more prone to failure. Contact your local Audi service department to have your suspension system evaluated.