OK the EB II Climate control display costs about $100 from my local wrecker, and it will fit in no problems. The only worry is over losing features, etc. You might get a bit of a trade-in on your current one too.
Replacing the whole dash with the EB II or ED one (these used better materials than EA-EB and are less likely to crack) is an excellent idea. But you will find that you can plug your old climate control, trip computer, stereo, etc, etc right in. The dash 'shell' is all you want. I hope to do this mod myself some day.
Hope this helps.
Jack Travis, E-Series Acting President
1989 Ford Fairmont Ghia turbo/GL replica (underway)
1994 Eunos 800M
1990 Ford Laser S