rear wheel cylinders?

[Tom Jennings <tomj@xxxxxxx>]

I can't figure out how to spec rear wheel cylinders for my 1970 Hornet.
The car had front drums, I switched to Bendix disks, so the rear wheel
cylinders are now too large in diameter.

I bought replacements last year, when I went to install them a month ago
I found they don't fit the backing plates -- I have Wagner wheel cyls
and I need bendix.

The rear axle and backing plates are 1970, AMC15, was a 232 auto trans.
Anyone know the aftermarket part number for these things? I can't find
my notes on bore diameter on my computer, I think they're at home in the
notebook.