I need Mark IV measurements

[BigMesa]

I know the short head is 18 3/4" wide, and the medium head is 22 1/2" wide, but what about the long head? And what is the height and depth of the Mark IV?

Thanks for the help, I need to see if this will fit my ATA case properly.

 

[MrMarkIII]

I think the terms "wide", "long", and "medium" are used interchangeably and mistakenly. There are two sizes of Mark IV chassis, 18 3/4" and 22 1/2". Confusion comes because Recto heads, for example, are 26 7/8" long, thus the need for a "medium" designation.
The 22 1/2" chassis has the graphic EQ and lead voicing switches on the front panel, between the graphic EQ and the output level control. This is the Mark IV front panel shown on Mesa's website.
My head cab is 9 3/4" tall, counting the feet and handle, and 10 1/2" deep at the widest (the bottom).