a 72 dart should have a 5 on 4 bolt pattern correct? and do they use a 1/2 20 stude like the b bodies? in 72 are both sides right hand thread? thanks mike

You are correct, all 72 darts came from the factory with a 5 on 4 inch bolt circle. The studs are 7/16 by 20 and both sides should be right hand thread.

thank you