According to Federal-Mogul's web site, 5662 is the front IROC springs. The 5665 number is for 82-86 Camaros, EXC Z28s (Summit says OEM for 82-91 Camaros and Firebirds). So what the heck IS the correct rear spring for an IROC? The CC635 is the variable.

JamesC

http://www.federal-mogul.com/moog/s...suspension.html

tt