looking for rare center cap

I am having no luck finding a missing center cap.. I have a 69 Fury III, but the wheels are off a 71 Chrysler ( I'm pretty sure ).. But the center caps may have been changed (although these do fit perfectly).
If I can't ever find one, I could possibly replace 'em all..... I am hoping ralleye wheel caps may fit, although I know they are shaped a bit different. They are beautiful wheels, and They look great on the car.. so I'd rather not chaange it up if I don't have to.
I took some pictures.. Also a picture of a 71 Chrysler, where the caps look a bit different. My car is the black one in case you can't tell in the pictures.. I since have flipped the white walls. I think it looks much better.
If anyone can help figure this one out I would be very pleased indeed.. I'm pretty sure they are of the "large bolt pattern" type. They are 6" wide and the bolt to the 2nd bolt after it measures 4.5 " Wish me luck... thanks

Attached Images
File Type: jpg wheel.jpg (37.1 KB)
File Type: jpg IMG_1540.jpg (39.3 KB)
File Type: jpg IMG_1538.jpg (40.6 KB)
File Type: jpg IMG_1539.jpg (46.8 KB)
File Type: jpg wheelie.jpg (62.2 KB)