I currently offer brake valve rebuild kits for a limited number of vehicles. My catalog is structured by model year and valve type. Kits for cars originally equipped with 4-wheel drum brakes are identified as a "Drum Brake Pressure Differential Valve Kit". Other kits are used for cars equipped with front disk and rear drum brakes. If you're not sure of the type of valve you have just read the description for the kits that are appropriate for your model year - the description includes a list of vehicles for which the kit has been confirmed to be appropriate. If you're still not sure, feel free to contact us.
Even if I don't currently list a match for your valve, the odds are pretty good that one of my kits contains the parts you need. Though stamped with different engineering numbers, many valves used during a particular model year differ only in the mounting bracket used. If I don't already have an appropriate kit I almost certainly have the parts on-hand to produce a new kit that's specific to your vehicle. If you're willing to send me the valve so I can take a look inside I'm sure I can either identify the appropriate kit or come up with a new one that includes the parts you need.