Mark for reverb cut out dimensions?

[ripit007]

I have a mark IV short head in a mark II head shell. No reverb installed in this one. Can anyone supply me with the dimensions of the proper reverb cut out in a mark IV chassis.
My plan is to re tolex the headshell, so while I'm at it I might make the hole the proper size. Thanks in advance

 

[gts]

I have a mark IV short head in a mark II head shell. No reverb installed in this one. Can anyone supply me with the dimensions of the proper reverb cut out in a mark IV chassis.
My plan is to re tolex the headshell, so while I'm at it I might make the hole the proper size. Thanks in advance

3-15/16" x 16-7/8"