Water Valve Assembly (for A/C unit) - 1969 Barracuda Formula S

Try these fellas. They do rebuilds for the firewall mounted 66-69 B body ones.

www.heatervalaves.net - not much of a website, but he is good to talk to.

www.heatercontrolvalve.com - slightly better website.

Restoration - Mopar Heater Valves | Original Air Group - Yet another source.