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.