Cherokee 8.25 to 64 Dart?

Don't go the measurement brom the backing plates. What counts is the measurement wheel to wheel. Like Inertia said you don't need shock mounts cause your dart has the shocks mounted to the leaf spring mounts. You can cut the leaf spring pads off (a hand grinder works good) and weld new ones on but be extremely careful welding the new ones on cause it's very easy to warp a rearend housing. Weld in 1/2" increments alternating from one side to the other to give it some cooling time. Also, make sure you have the pinion angle set right when you weld them in place.