Toasted transmission

Chk the sprage race OD, the bushing ID and you should be good to go.
Pretty sure they are all the same but still.

The holes are just to let the fluid exit the drum onto the band or sprag. (Whichever place they are)

A light cross hatch sanding on the outside of the drum where the band rides with something in the 320 wet/dry range before it goes in.
Same with the sprag race surface. (it helps them take hold better)