Quoted from flakeloaf:My bunker and control room holes are pretty reamed out and it's hard to get a sensible measurement. When someone has a sec, could you please verify that they're 1 5/8" by 1 3/8", and the power shed is 1 3/8" square (which could explain why it's such a hard shot!)?
While not the greatest photos, perhaps this will assist with your request.
Gord
P1000564 (resized).JPG
P1000565 (resized).JPG
P1000563 (resized).JPG
P1000562 (resized).JPG
P1000569 (resized).JPG
P1000568 (resized).JPG