basically you can have two tabs coming down off each side fo the frame and on the out side of the shackle or leaf, drill holes in both tabs and use any sort of pin you want. you could even put a tiny bumpstop on the bottom side of the frame for an even quiter ride. i was thinking about makind shackles and drilling a hole in the shackle so the pin would go through the shackle.
I'm gonna build a couple sets. Do I need some chevy type shackles in addition to the toyota shackles? thats what it looks like... I'm thinking of using a 6" (hole to hole) Toyota type shackle and a (stock?) chevy shackle. I think a low profile bump stop or something would work well to cushion the top shackle from bouncing off the frame all the time. I'd like to make something that works right the first time, so I don't have to fiddle with it again and again...