I'm sorry, I meant the text that you showed and referred to.
As for the adj. slots on the drums, you know that hasn't been around for a time so that is a no-go.
FORD used a similar system on the 54 and early 55. It was found to retro-fit the late 55 and 56 type to earlier applications as correct original service parts are hard to find. Everything is CHI-COM now and makes it even worse.
You can find quality rear shoes but not the front. I think it has something to do with going to front disc or the rear shoes being from a later similar application.