OK, bought the 140 Behr regulator from Partshop. In fact, it didn't come with the extension cable that seemed to be what was called for(i.e. remove it to fit the 140, keep it on for the 210's.) In fact, I had to spice in and extend the wiring by about 14 inches, which wasn't a great problem as I just used the old blower regulator's wiring harness. Anyway, It works great.

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Ken G
96 S500 79K (great white whale)
98 E430 80K Sports Package (gray ghost)