possibility #7 might be a fix for only this situation and not good as a "policy/rule" would be to allow the use of the 4 bolt hubs and 13-14" wheels of the other ITB Dodge 024 chargers etc.

i just looked at the GCR and i might be off in what cars i remember being the same basic body style. no real idea if this is a hard or expensive fix.

just tossing this out as a possibility in the form of electronic brainstorming.....