[Joe K]

The flywheel housings are the same between AR Multi-disk and the later single plate clutch.

At least I'm not aware of any "functional" differences. There may be AR "details" that make the housing identifiable to an AR (part numbers cast in?) But the multi-plate difference primarily occupy the clutch pack itself, the bell housing, and the flywheel.

$40 and a antique auto part flea market could set you up with a new uncracked flywheel housing. Possibly Ebay at lesser savings.

As to the "pieces" you're seeing - could come from any small pieces/teeth that have come loose.

The nice thing about the multi-disk is that there can be a number of "small" failures, and yet the clutch will work fine. Big thing is the condition of the flywheel grooves, and how much dust is packed in hanging up disks.

I would "break down" the clutch pak, clean everything, and see exactly where the fail was before making any decisions.

In breaking down, read carefully Victor Page's "Model A Ford, Construction, Operation, Repair" book which shows the original tools used to "deload" the spring loaded clutch pak. Clutch-pak literally is an "accident waiting to happen" with pent-up energy. A shop press or even all-thread/steel disks can be used to restrain and disassemble safely.

Good luck. Multi-disk is a "different animal," quite resilient, and actually highly thought of - until the dusting accumulates in the grooves.

My mind goes to the "rubber clutch" of the original 40Hp VW Bugs.

Best regards,
Joe K