Here is a Stasis SL rear spring male perch for all B8 Chassis Audi applications that use 2.25" ID springs. Fits:

2009-2016 Audi A4, S4, RS4 A5, S5 and RS5. 

Thread size M52x1.5

Part number: SE202-S30-52-00

Compatible with Ohlins female spring perch/ platform 00531-01 and jam nut 00532-01.

New old stock. Anodized, CNC-machined aluminum.