Dodge truck help

I was pondering I'm going to have to put a rear end in my truck sooner or later. What will I need to change the 5x5.5 bolt pattern to the bbp of earlier years. Mine is a 90 if that makes any difference idk. New to the full size trucks so I dont know every thing also will the hub caps on the green truck fit the big 5x5.5 ford wheels. My truck is the blue one I have steel wheels to fit it but my cop car caps are too small so I'm looking into other options.

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