Alpine type X's? will they work under the seat

[05blackbeauty]

I want to put 2 10" type X alpines under the back seat of my 2005 sierra extended cab. i was wondering if there was anybody who could tell me if they will work with the amount of space i got and still get the right air space for the speakers.

[Wingnut]

What are the airspace requirements for the speakers? I have 2 10" Kicker Comp V/Rs under my rear seat and they fit and sound perfect.