Can't help with reg disassembly unless you can get a pic looking down the holes.
Just take the reg with brushes in situ to an auto elec, a good one will look at what he has that is same or close and if need be you just sand them down to fit.
They will have a tool to open the reg.
I got a box of 10 to suit the 55amp Bosch alt in my pos for $11. They're a smidge too long so I just take a bit off with a grinder.
Don't overthink it.
DL
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