The rear shackle bushing on SS spring eyelet require a (7/8 o.d. x 1/2 i.d.) bushing. A-body shackles bolts / shank are .50" and are compatible. I believe B/E use the slightly larger, .5625" or 9/16" shank bolt x 1.0" o.d. bushing. I ran into this issue when I installed SS spring on my E-body.

The kit listed most likely will have the same incompatibility with four of the rear shackle eyelet bushings. Not sure about the large front bushing.