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.