Who knows? Maybe it's the dimension of the CRT itself?
Look at "rack dimensions" too. The front of the TV doesn't always have to sit flush with the shelf.
The 32" widescreen CRT TVs are pretty huge-- 53kg-- over 115lb. You could get yourself a nice 32" plasma-- 9.2cm depth and only 24kg.
Best regards, Spehro Pefhany