SG stickers won’t fit, they’re meant for the 19mm “slim” CBC pad size that has kind of become the standard for size C bearings.
Duncan Friction Stickers are meant for small bearings as far as I’m aware so I think their inner diameter might not fit properly.
I was going to suggest 555 diff pads (not sure on thickness, they come in 0.15" and 0.30") but they seem to be out of stock. they were out of stock last I checked but seem to have some now.
There are General Yo pads in stock in the 555 size, but I’m not sure how thick they are / how they’d fit in the M1. the Hat pads might also work but I’m not sure about that:
You could try making your own “baz/chaz pads” with some plastidip and naptha:
If I could find a way to consistently cut pads to the 555 size (without, yknow, using scissors for individual pads) like via a custom punch or something, I’d consider making a bunch and offering them up at cost.