727 Disassembly and Advice

VOETOM said
Wide bushing is 71 later, narrow are those before. Chrysler made sweeping updates in 71 to fix a lot of older issues in TFs. The wide bushing retainer with slots in the retainer instead of holes was one change

I just did a search and from this thread here it looks like I've got a post 71 retainer, but with a pre 71 bushing in it?

https://www.forabodiesonly.com/mopar/threads/727-4-clutch-direct-drum.534248/
If this is to be trusted it mentions that the post 71 4 friction disk drum has the groove higher up in the drum, whereas the pre 71 3 friction disk is deeper in the drum. Is that accurate or is this still a pre-71 retainer?

Edit: Nevermind, I can just barely see what you mean with the slots from a picture in that retainer, the slots in the bore as opposed to holes. I'll look into finding the correct retainer.