I'm planning on doing a rear brake job on my Coronet. While I am at it I might as well do a little upgrading if I can. I was thinking there was factory 11"x3" setup out there. I was wondering what the interchagability of Mopar rear drum brakes was like. I thought I had some information on this somewhere but I can't find it for the life of me. Are all drum brakes on 8 3/4" rear ends interchangable or is it body/year specific. Basically I have a 1966 Dodge Coronet with what I believe is its factory original rear end housing that currently has 10x2 1/2" drums. If I just rebuild what I have I will probably have to get new drums anyway so the cost of new drums is irrelevent. I hoping a trip to the salvage yard might turn up some decent backing plates if I knew what I was looking for. Also I would like to retain my factory park or e-brake. Thanks!