Finally got the oil pan out.. After many many hours of hassling and struggling it's finally over. Ended up having to cut my exhaust pipe at the bottom of the crossover to drop it. This is what I saw between the oil pan and the transmission. It isn't the rear main seal, at least judging from what's in my Felpro kit and comparing sizes. Is this something I should be worried about? Needing to separate the engine from transmission to fix? Can I leave this alone?