I bought some new rear leaf springs at a spring shop and everything was the same as the old ones except for the size of the eye at the end that mounts to the frame at the front (ie. without the shackle). They sold me two piece bushings that fit in the eye and accommodated an 18mm bolt. I saw the bag they got them out of and it had a Toyota part no. on it. My problem is, I want to go with polyurethane instead of rubber and I need to know what year truck these bushings came off of? Can anyone help me out? Thanks in advance to anyone who responds. Oh yeah, my truck is an '86.

Sounds like you got either a front spring bushing set or one from an '83 or older pickup. Those have 30mm OD bushings on both ends. The '84 and later rear springs have a 40mm OD bushing in the front spring eye:
- http://www.4crawler.com/4x4/ForSale/Shackles.shtml#PolyBushings