I got asked to share the numbers for the pop rivet studs and the nose peace for the morrison type rivet gun. so here they are. there are a number of GM clips that use this systems but as far as I know the only Pro car manufacturer that did was S&S. they used a square clip but after buying 3 boxes of them I discovered that the gray ones work just fine on the 71 up. here they are. the nose piece picture dosent show that the tip is recessed and the rivet slides down int it