Of these two which do you recommend- one is aluminum the other steel. also is the HD pin necessary

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Either should work fine, I run an aluminum one on my '85, but that is mainly because I needed to custom fabricate one myself to fit the deep receiver in my rear bumper and AL was easier to machine and since I planned to leave it installed in one of the 3 receiver tubes all the time, I didn't want to worry about it rusting in place:




I run a 7/8" shackle and a regular receiver pin, seems to work just fine.