They were offered optionally on lots of Ford products in the late '70s and early '80s. Everything from Mustangs to Pintos to F-Series and FSBs (maybe even Fairmonts and Granadas too).
I checked into them at one point, but a couple of negatives:
1. The diameter of the hub is bigger than the EB's column, so it would look like a mis-match.
2. A lot of the ones you find for sale on eBay are from Ford products that had the horn button on the end of the turn signal stalk, so there's no horn switch in the center of the wheel, just an emblem. About half the sellers admit this; others you have to inquire. One even replied with something like "Well, I'll be damned. There IS no horn switch!"
I found that ones in nice condition with functional horn button went for $200 or more. I ended up going the Grant route instead.