8 3/4 REAR - WHAT size brakes? 9" or 10-11"
when i bought my rear wheels i bought big bolt pattern if that helps. 5xdarn i forget. the size.
5x4.5"? If you've got big bolt pattern wheels, then what you've got isn't stock. You could have re-drilled small bolt pattern brakes, which would be 10x1.75". That would be easy to see because you'd have an extra bolt pattern drilled into your drums. You could also just have 10x2.5" big bolt pattern brakes, but if that's the case you have aftermarket axles. And of course, since we already know what you have isn't stock, you could also have any of the 11" drum set ups, either 11x2, 11x2.5, or 11x3. Yeah.
Best bet is to measure everything, figure out what brakes you have, and then take the offending wheel cylinder with you
anyway. Because there are several different bore diameters available for mopar wheel cylinders, and who knows if you have the "right" ones on your car now. So, you'll want to get one the matches the other side. As was already mentioned, removing the wheel cylinders often results in needing a new over axle brake line, so you might as well know if you need one when you head to the parts store.