Need rim/tire guidance on 68 Dart GT

Check these guys out.

https://search.aol.com/click/_ylt=A...ues.com//RK=0/RS=va301OCiBkUqE0Ua5NtHSRGHchs-

That should lead to Wheel Vintiques in SoCal.
Way down at the bottom of the page there is a "Custom Backspace" section.
Summit Racing sells their stuff, but I don't know if they do the "custom" at Summit.