Greg is that kit for the large style rubber seats or the standard size rubber seats? I'm thinking Chris might mean for the large style rubber seats which I don't believe are made anymore, but I could be wrong. It would be great to get rebuild kits for the really vintage valves.
Normally I just replace old valves with new ones, but if there is a flow washer in the output of the valve, you need to take the old washer out of the old valve and install it in the new valve. The flow-washer slows down the rate of fill for solid basket washers in order to prevent overfilling.