I am building a CB-70 rack type system. My local Office max does not have the tubs in stock, so we ordered them on line and they will not be here until tomorrow. At Office Max the tubs are listed as 6" Height, but I was wondering if that is including the lid as when I look at the directions from Baileys reptiles he is placing the supports at 7 1/8" apart. If I subtract the thickness of a finish cut 2"X2" (1 1/2" X 1 1/2") from that I get a 5 5/8" opening. So is the actual height of the CB-70 tubs 5 5/8" without the lid or am I missing something?