Erich,
Not sure which model you're referring to but here's a couple of drawings that may help:
https://cj3b.info/Drawings.htmlhttps://cj3a.info/index.htmlBTW, my '54 3B horn button is about 28.25" from the floor (the fuel tank was in the way for a direct measurement).
Added: After thinking, I believe the measurement from the toe-board (along the steering column) up to the horn button would probably be more helpful! I measured 31 1/8" for that.