They're here!

Replacement, bolt-in heater valves for 75-91 240.

Nearly two years in development, this heater valve will bolt to the support bracket by the vacuum reservoir in your 240.  This is where the blower fan motor grounds.  Best of all, the stock heater hoses will attach to this valve with little or no modification, as will the existing, stock actuator cable. 

While there may still be a few "Ranco"-style heater valves floating around out there, I've confirmed through the company that owns the tooling that they are no longer being manufactured, and there are no plans to bring them back currently.  Prices are getting a bit, well, high, to say the least.

The later style, 92-93 valves are available, and they will adapt to the earlier cars, but the installation is not as straightforward as advertised. 

These valves bolt into place easily and the precision machined bracket is rust proof and very solid.  $100 plus shipping.  Includes hardware to mount.

This valve can be fitted to 92-93 cars, but modifications to the hoses, and an earlier style cable will be necessary.