I have found a set of magnum 500's for sale the man says came off of a 72 cuda I have a 64 dart which I have converted to LBP I have never measured it but assumed it to be 4.5" The wheels for sale are out of my area so I had a friend who is a mechanic go check them out he says they measure 4.25 center to center the rims have chrysler logo stamped on them so they are factory this is one I am not familiar with any info would be great