Oil filter adapter gasket

Anybody know for sure what the factory did?, every engine I have pulled apart that seemed stock had only a circular gasket on the blockside of the plate and nothing else. Felpro used to have the "wagon wheel gaskets" and they always leaked on my stuff so I just used the circular gasket and nothing else,I don't think felpro even makes those type of gaskets any more as the last few gasket sets I have did not include them and I cannot find them anywhere for reference.