I am looking for a backing plate nut and bolt for my 1972 Plymouth Duster 340. Therte are 4 total but the one I want is completely different than the other 3. It is the one on the bottom and toward the rear of the car. The reason I need it is that the nut is thinner to avoid hitting the self adjuster cable. The nut and bolt are somewhat stripped out and I don't want anything bad to happen. (I know there are 3 more but I worry) Could someone help me find a couple?