Stephen, can you give me any dimensions on the spring bushings you sell for a superlift front spring as far as overall width of the bushing when installed in the spring eye and also how long are the inner sleeves and what diameter is the OD of the sleeves? The problem i'm having is that i have an 89 blazer and GM changed a few things this year as far as bolt sizes on the shackle end of the spring. 1973-1988 GM used 7/16" bolts at the rear of the front spring but starting in late 1988 GM changed that bolt size to 9/16" and made the shackles a 1/2" longer for a 4 1/2" center to center on the spacing of the bolt holes but still used the 7/16" bolt at the frame eye shackle bushing. I've bought both the superlift and also the energy suspension frame eye bushings and the inner sleeves are .200" shorter than the factory sleeves and also than the superlift inner sleeves for the springs so that would make the shackle taper inward at the top which isn't correct. As i have laid out a bunch of stuff new and used in the garage i have enough items to piece together something that will work for now but i have to make new shackles to do so.