Question on chassis size for Maz Jr. combo cabinet

[m3moser]

Hi- I've been asked to build an amp reusing a Dr. Z combo cabinet. I would like to use the same dimension chassis as the original amp. Does anyone know the chassis dimensions for the Maz jr. amp? I assume Dr. Z uses many of the same size chassis for several models as I see pictures of blocked unused tube socket spots on the Maz Jr. gut shots. Thanks, I really want to avoid drilling new holes in the cabinet if I can avoid it.