Metering Valve leaking

[astroracer]

Does anyone have a source for a rebuild kit for the metering valve in a disc/drum proportioning valve? The one in my 56 wagon started leaking the day and all I can find are complete proportioning valves. I guess I can take mine apart and measure the o-rings but an off the shelf kit would be easier and quicker...
Mark

[astroracer]

Still looking for some help with a rebuild kit. I pulled the valve out tonight and figured out why it is leaking. Here is a pic of the valve.

The rubber hat is what's leaking. There is a shoulder on it that slips down into the assembly. The joint from the "hat" to the "shoulder" is ripped. Not a good pic but you can see brass when I pull the hat up.

Does anyone have a source for these seals?
Mark