One 15 x 8 Cragar SS wheel sbp

A 1975 Dart Sport would have the 5 bolt 4 1/2" bolt circle (not 5 on 4") unless someone transplanted a rear end or front brake hubs from a 1972 or earlier car.
Post a close-up picture of a wheel on the car now and many of us can pretty much tell just by looking.

5 on 4" is what is refereed to as Small Bolt Pattern or SBP.

Hope that helps.
Yes, thank so much. The wheels on the rear are pretty skinny. I also have a slant 6 did they only come with a 7 1/4 differential? I'm just afraid to order online cause i did that last year for 1 SS cragar rim & it was the wrong size & it cost me $80.00 to ship it back to the company. I wanna buy the widest rim i can get on there without having to move the springs yet. These A bodys look so great with fat tires on the back. I tried to upload some pic's but it says the image is to big.