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?
What do you mean by it had .005 thou clearance.
You said the rings were locking style. I assume you mean that you put the sealing rings on the parking gear that slides into the output shaft support. Locking style sealing rings should be self adjusting.
Where are you measuring the .005 clearance?