shoe . . . the shackle "pin" with the coarse threads is threaded into a bushing that can be pressed out of the cast rear shackle bracket that is riveted to the frame.
I have bought a dozen or so sets from ebay over the last 2 years at about $15 - $20 a kit
If you are talking about the forward spring pivot bracket that has the bolt that threads in . . . or if you need just the rear most bracket that holds the shackle pin, the wrecking yard is where to go or some place that sells used parts like that place in Arizona with the big ugly guy with all the rust free trucks and parts for sale.
