Check out the heater valve available at wagonmaster.com. Once again, I have no connection to the product or it's designer, but it looks like a nice fix for 240 heater valves.
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john

I don't care for them personally. I think the change to a completely mechanical setup is a good one. The capillary tube is probably the most problematic part of the old one. I just don't care for making the swap from the old style to the new. Despite the directions, it's not a simple matter.

I spent forever scrounging up about a dozen of the Ranco replacement valves a couple of years ago. Probably could have found more, but diminishing returns. I have only one left at this point. I'm thinking of saving it for a museum.

I was so disappointed in the 92-93 valve, after doing it in my wagon, that I've developed a bolt in replacement that I'll have to market, probably in about a month. The prototype is done, and it is easy to install, right down to connecting the existing hoses without too much trouble.

DS

Either way it is not a fun job, you might find it a bit easier by taking out the front driver seat first. I would replace the it with what is currently installed it will make the job more straight forward.

Another option is to locate a new ball valve on the passenger side of the footwell. Easier to install but you will need to regulate the heat from this remote valve.
Dan