Coilover Parts-911 Springs (Perches) For Sleeve Converion Kit Bilstein RSR Struts (Rear) 1972-89
Extended Length Rear upper perches
Coilover springs do not fit into the top of the tapered chassis cavities where the rear shocks mount.
These extended-length upper spring perches solve the problem by moving the spring down where it doesn't contact the chassis.
The perches are available for 2.25" springs. Or you can add a 2.25" to 2.5" adaptor to use 2.5" springs.
They have a 14mm ID to fit Bilstein RSR, HD, and Sport shocks.
Also available Upper Perches for '65-'71 cars.