You got it, and they did vary between flat and Phillips on the body halves.
Watch for the check balls to fall out if you open the two halves, and I also have the diagram for where they go if you end up needing it.
It'll be interesting to see if it has an accumulator spring in it or not.
That spring cushions the apply of the bands for softer shifts and can be removed and the accumulator piston can be blocked so it doesn't move.
(a little more bang to the shifts):D