Im interested in the AP rack as my first rack since is very versatile and i dont have a lot of space

But i see the Sterilite Box 1754 & 1756 are no longer produced(?). Did anyone find replacing tubs for this? without risking scaping balls? I sent an email to AP but they havent replied to me yet.

Also I see is a "belly heat" rack, what does that mean?? is the heat in the center of the tub? wouldnt that be bad for the snakes not to have a cold side to retreat to? or am i wrong? Again this would be my first rack so i am not sure what belly heat realy is...

Any extra info that i didnt think of would be appreciated

Thanx!