I'm swapping on a pair of Trident exhausts and I noticed they do not come with new gaskets. I thought that might be the case, so I checked with my dealer about replacements. They can order them obviously, but I'd like to get a set sooner rather than later. The exterior diameter of the pipe is 1 5/16". The factory part is PFKL2637170 but there are no specs for it. Anyone have any luck with a generic exhaust gasket donut? If so, what did you use?