I have a small oil leak right at the back of the oil pan . I can see the cork gasket there so I know the previous owner did install that. There is a half moon metal piece at the end of the oil pan near the top below the cork gasket area. I don't know if there is a name for it so sorry if I can't name it. Anyway my question is is there a gasket behind that and is it ok to take off the 3 bots to see without messing something up. thanks