Hehe I'm tempted to 'stick' this topic to the top because I'm so enthusiastic for more info into the black buttons issue. The only difference with the ED Climate control unit is it says 'CFC free' or something.
The size of the units is the same, the loom is the same, but apparently the are other complexities. Beyond that I don't know, but as soon as I am ready to pursue the matter further I'll be doing more research.
Jack Travis, E-Series Acting President
1989 Ford Fairmont Ghia turbo/GL replica (underway)
1994 Eunos 800M
1990 Ford Laser S