At a hardware store, they are just the caps that you would use to cap a copper pipe with, Im pretty sure I used 1/2 inch... Good luck... -Nick
"My family hauler can kick your family hauler's @SS!" ~~~~1999 Contour SE Sport~~~~ -KKM True Rev -Custom cat back Flowmaster exhaust -All Cat's fixed. -SHO Shop Off-Road Y-pipe -Many other Mod's done...