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I was looking at the rear leaf hangers for 95-97 f350s on Rockauto.com for my 79 since they aren't reproduced and was just assuming there'd be some minor mods to make it work, probably just drilling some new holes, they look close. IDK if they'd work on a 77 or older frame, not sure what the differences are. Idk where to get bolt on front hangers, there's aftermarket hangers available for custom installations, but they'll take some fab/welding to make them work.