Inspection of a 904 torqueflite

In working on putting this back together. I was able to put a used but good output shaft support back in. It didn’t go in as smooth as the old one. I had to tap it in with a rubber mallet.

On the output shaft itself. I installed 2 new locking style ring seals. Greased them down with transmission lube paste. They will not compress down into the output shaft support.

I took one of the seals off and put it down into the support by itself. It shows 0.005 clearance.

Is there a special tool or technique to get these back in?
Should I file them some to get a little more clearance?