Originally Posted by jdc_va_usmc
1) ... had small o rings around them, but that's it. It didn't even seem like sealant was used.
2) ...is it safe to assume I can just replace the o ring, install a new gasket behind the cover, and all will be well?
1) - no base gasket, just the 2 small orings and some sealant (there are many opinions on which sealant) - just be sure not to clog the oil passageways.
2) it is not safe to assume that;) does snowbum have a long, wordy article about it? re-read it a few times OR find yourself some local airheads (I did). It is not complicated, but you want to be sure you have measured everything appropriately and add/subtract shims as required. the danger is not having correct oil pressure.