73-77 GM mid size ( Malibu, Cutlass, etc) and GM full size 77-96 will fit 79 up RWD Caddys. Regarding my 82 Fleetwood Coupe, I had a 1 1/4 front sway bar off a Trans Am on it for a while also. I cut one coil out of the front, stock rear springs, KYB Gas shocks, and Helwig super HD sway bars 1/ 5/16 front, 1" rear. 1 degree negative camber, 17" tires 275/40 and 315/35. It does 1 G of lateral acceleration. You must have racing seats and a harness to drive it to it's potential. Also it's undefeated in High Speed Autocross. (Road Race Tracks)