Michael,
The original pilot adapter is simple press in place with a thru hole for the needle bearing as far as I know. My problem is that all of my car was "re-engineered" by owner #3......who is unknown and didn't leave any instruction manual with what they built!!!!
If you look up a Dash 1 Pantera adapter, you will find all the same pieces as were used in the GOose, including perhaps the leather seal....
Attached are some early Pantera bits....pic and a drawing of what John found in his early P-car! (Thanks John...your efforts continue to edumacate folks!!!)
Steve