Everything should be fine and fit. You dont need new shackles, just re use them if they are good enough. My u-bolts fit with about 3 threads sticking up past the nut. If your uncomfortable with that, or you have to cut them off, youll need new ones. I used stock bronco 2 shocks, gabriel ultras, from autozone and they work just fine. You also may need 2 spring center bolts if they break when your trying to flip them. Be prepared to cut all your spring eye bolts (at the shackles and hangers). To put regular grade 8 5/8" bolts in, you need to be able to tighten the nut on the back of the hanger. Buy a cheepy wrench (IIRC 13/16") and cut it off real short so you can slide it in to get on the nut.