HAPP buttons - quick question

Can anyone tell me the height of a standard competition button from HAPP?

If you mean mounting depth…

without switch - 2 1/4"
with switch (to common terminal of switch) - 2 3/8"

So if I have 3/4" mdf, how much space below the top mdf would I need. Like how much air space would I need.

So it would be 2 3/8" - 3/4" mdf = 1 5/8" air space?