Found this in the back section of the oil pan nearest the transmission, not in the oil. Most curious about the large e-ring. The small disc is roughly the size of a penny, it and the other ring were farther back up in the bellhousing. I wondered if maybe these parts were replaced at some earlier time and the old ones were dropped or left in there, it was driving fine and didn't seem like anything was amiss. The large ring appears to be broken to me. I don't really think the little disc is actually a part of something, it almost seems like a tab that's meant to be broken off, kind of like a knockout in an electrical box, if that makes sense.