4" backspace on 20" wheels

It's been very difficult trying to find an 18-20" wheel with a 4 Inch back space. Typical Chevy 5 by 4.75 bolt patern, 8" wide is fine. 8-9.5" on the rear is fine, but the backspace is making it very difficult. I have to have it to accomodate the exhaust on this car, as many of you may know. And, it's what I have to have for this 64 Impala after installing 4 wheel disc brakes. Foose, Centerline, Boyd, Asanti, and other custom wheel builders have them for two arms and a leg, but I can't help but wonder who might have something, possibly old school, for a fair price, that will offer small offset for the calipers and a negative offset to the tune of 4" or less backspace.

Never thought it'd be sooo difficult!

 

what's a foose?

 

we like steels,orginal wheels,old halibrands and the al mighty astros.throw in some wide whites and yous got yorself a winner.but not twentys,its just not our thing.