I usually have a car friend look my stuff over when it is a big project and he always finds stuff like that. It cost me a beer each find so he usually leaves wasted (but he lives next door!) LMAO
Well, Don, I know what goes there but I don't think I have one. I can't remember seeing anything in that diameter in my box of parts and since the transmission hasn't been run in the car before, it makes sense that it isn't there.