Because I am removing the old transmission case rear due to its damaged missing bottom hole along with the new replacement transmission mount, what additional parts do I need to replace as well? For instance, the rear transmission seal should be replace along with the gasket of the transmission case rear. Should I also replace the bolts on the transmission case rear as well? What about this so-called O-Ring on the transmission case rear location as I don't know where that goes to? If I can find this o-ring location on the transmission case rear, does the old o-ring needs to be replace as well? Isn't there a gasket kit including transmission seal, o- rings and bolts on the transmission case rear area? Any other additional parts to be replace around the transmission case rear area? Comments, advice/feedback is greatly appreciated.

I did some research on the gasket/seal set and found it. It is part number 126 270 61 00 gasket/seal set.t number 126 270 61 00 gasket/seal set.