If there is no gasket listed I would think it is a sealant that's used. A good quality automotive type silicon should do it.Hello -I need to take the right side cover off my 2022 CB500x as well (for a different reason than you). I was wondering if you need to put on a new gasket when replacing it, and if so, do you have the part number for that gasket. I'm not having much luck in my research regarding a specific replacement gasket for that cover.