the 3.0+5.0 means the off set meaning the center of rim is 3" in from outer bead on one side and 5" in on the other side
the bolt pattern you will need for the rear is 4x115 and fronts are 4x156
and size all depends on what size and kind of tire you plan on running but 9x8 or 9x9 is pretty common for the rear
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