Auto Choke

Does anyone out there have a source for the heat activated, automatic choke unit that is located in the top of the exhaust manifold, secured with two 1/4" bolts. Mine is totally manual, heat actuated, no electrical connector, linkage from the thermal unit to the choke linkage on the carb? 1965 Barracuda Super 225, Carter Ball&Ball. I have worn myself out looking for one on the net.
Norm