Disc brake wheel studs

In most case I could drive the rear stud out and draw a new one in with heavy washers and a nut. That was just in replacing a bad or broken stud though. Your different size knurl might be a issue.
Still don't know what vehicle you have.. is it 7/16 studs @ 5 on 4" pattern? If so.. will your wheels fit onto 1/2 studs @ 5 on 4" pattern?