I think I know the answer to this but I'm looking for some input. I'm rebuilding a '98 RM 250 that I just bought and it has a Boyesen Racing Clutch Cover. I bought a Moose complete gasket set and the clutch cover gasket is an O-ring. The Boyesen cover doesn't have a groove that the O-ring will fit into, the surface is flat. Do I need to get a flat paper gasket to work with this cover? Where do I get one?