I do appreciate the responses but this problem is almost unsolvable. There are wheels with the correct bolt pattern but they will not fit over the front calipers When we were drag racing a popular rear end was from a milk truck. It had 5.38 gears and was a full floater. But the wheels were 16 inch. We took some 15's of the correct width along with the originals to a wheel shop . They cut the centers out and welded them to the 15 inch wheels. But that was a long time ago. I doubt a wheel shop would do that today for fear of litigation. But that is an option. I know some owners run radials with radial tubes on the split rims and are happy. But I don't know if that is an accepted practice. Something to do with the width of the tire bead and the pressure applied. Others simply use bias ply!
Moisheh