help needed with 904

I had to drop the ball on this transmission for 48 hours to go camp at the dragstrip and race all day. It was ruff, but someone had to do it right?
Back on track today. I have to get a tailshaft seal? The innerseal is correct, but the outer is smaller than the circumference of the tail housing. They're both the flat kind. The one from the kit is the kind that protrude out in the back and have a little half inch protruding. Probably some kind of upgrade? And to re-recap LOL this will be trip #4 down to Portland Transmission! Soooo I better pull that pump back off and see if I can get another thrush washer. And remember where I was at with this project.