These guys are in Michigan.
Weldcraft Wheels Wheel Widening Wheel Repairs Wheel Restoration They did mine when I had my 70 Camaro, went from 18x8 to an 18x15, the wheel with the tape measure across it is mine. When balanced with a 31x18.5x18 tire, one took 1/4 oz, the other took 1/2 oz, they do pretty good work.