55.2-59 1957 Chevy 3100 Rear Spring Front Bushing

[57tailgater]

I am starting the process of swapping out rear springs in my '57 3100. The "new" springs are from a '59 3100. I had ordered (from a reputable company) new pins and shackles in preparation of this. When getting the new front pin kits out I noticed the bushings looked short. They are 1-3/4" long versus the springs being 2" wide. I assumed they would match. Anyone experience this and if so what did you do? Am I missing something? I don't see where any seals are used. Any help is appreciated. TIA!