Do any of the Stihl 028 series take any type of paper gasket between the carburetor and the intake or one between the carb and air filter? I can not find any gasket information on the Stihl parts lists that I've looked at. If the case is no gaskets are required - why do all the imported carburetors typically show 2 gaskets with the same hole spacing but different outside shapes? Typically confused!!