Mark III head dimensions=Mark IV head dimensions?

[Aegis]

Would a Mark III head cabinet fit a Mark IV chassis inside? Or is the Mark IV slightly bigger? If anyone has the dimensions of the Mark III head cab that will also help.

Also, the Mark III head was only made in long versions, correct? Or were there short versions as well?

 

[phyrexia]

Mark III Short Chassis = Mark IV Short Chassis

I am not sure if the long Mark III is the same width as the widebody Mark IV.

 

[edward]

MKIII heads came in long or short chassis. Currently, my MKIII short head is mounted in a MKIV head cabinet ...mounted right up like it was made for it

Edward