1969 Dart GT vert Cragar REAR wheel size help needed

I am 98% certain that the only ones that are Uni-Lug are the ones where two or more bolt circles are listed. The whole center casting is unique when it has the 5 x 4" pattern. The wheels even use a smaller center cap. This is what the 61C 15 x 7 looks like (1521912402B):
CRR-61754_ml.jpg
Those holes look pretty round to me, and the specs at Summit Racing says it has 4" or 101.6mm bolt pattern (equal).