15x7 5 on 4.5 with 4.5-5 inch backspacing

anyone ever heard of such a monster? in putting an M-body 8.25 axle in my early-a, and it has .72 inches approx more per side than an a-body axle. im trying not to go the shorten-the-axle route if i can. I do know that a 15x7 with 4 inch backspacing fits like a glove on factory setups, so i could probably get away with a 4.5 inch backspace. Point in question, does anyone know of a manufacturer that makes such a thing? or someone who could build something like this? Im evidently not very savvy on finding anything as of yet....

check out summit racing.........lots of stuff there, centerline has multiple choices along with other manufacturer's, crager, wheel vintiques, american racing...........u should chk. out motech, they have an add to the right on this page.........they make 17x7, 17x8, w/4.25, 4.50 respectively, and are killer looking wheels for a comparable price.........just bought some black streeters from them, and they fit awesome, look great on my 66 valiant.........chk. them out.
higgs