A-904 shift kit

Let me add a note about the Teflon rings if I may.
For one I would only recommend them for an experienced builder, because they are so damn easy to pinch and cut during assembly. (Even with shaping cups and covers)
The other thing I don't like about them is they eat into the metals they are in contact with more than iron rings believe it or not.
I have seen more worn out stators, ring lands and drum bores from Teflon rings over iron by a long ways. (especially with aluminum parts)