Q-Logic under seat box in a 2013 Avalanche

I'm looking for a sub box for my 13, and I think I want to go with this one:

http://www.ebay.com/itm/00-07-Chevrolet-Tahoe-10-Hidden-SubWoofer-Box-Black-Color-Only-/370926691802?pt=US_Speaker_Sub_Enclosures&hash=item565cf425da

It says that it is only compatible with 2002 - 2009 Avalanches, but I didn't think anything changed in the back seat configuration from 2009 to 2013.

Does anyone know if this box will fit into a 13?  And if not, what changes were made between 09 and 10 that would stop it from fitting?

Did you order this and how did it turn out?