[Jim Ferron]

Anybody can modify a 'regular' wheel. Take the center from a 15x 6 or 7...drill out the factory spotwelds. Take either a 15x8 rally or truck wheel [six lug and usually cheaper] and do the same..

take the center from the narrow wheel and weld it into the wider rim. True it up first on a spin balancer

I've done it a couple times...any body shop or mechanic can pull it off if you don't want do. $150 labor seems like enough.