Sorry for the dumb question. I'm still very much in the learning phase of car mechanics right now, but I am trying to figure out an oil leak I have on my 1977 124 Spider. Trying to figure out the name of the part and what it does. Also, has anyone else had this issue, and if so, how difficult is it to replace? I'm hoping I only need a new gasket.
I have two photos below. The oily one is my car, the other is from Eldest Builds on YouTube. Thought it might make it easier to identify if I included both.

