I just removed the stock pipes from my 01 fatboy to put on a used 2 into 1 i bought from someone that said it would fit. When I pulled the stock pipes I saw that the face of the pipe where it fits into the exhaust port is tapered and so is the gasket. On the new pipe the face is flat. Can I get gaskets that are flat to replace these and make the new pipe fit or is this possibly the wrong pipe for the bike. The pipe lines up perfectly except for that.