I needed new rear spring shackle bushings for my MiniCab, and couldn't find any direct replacements, so I measured the old ones, went on-line to Summit Racing, and found a set that I figured I could make work. - I had to resize the metal sleeve from 1/2inch to 13mm to fit the shackle bolts, and trim two of the sleeves to length, but otherwise an easy fix. They are "Prothane Leaf Spring and Shackle Bushing Sets 4-1005", part # PTP-4-1005. - - Race quality for a MiniCAb!! Hope this is useful for someone.