Crew cab sub box

[Redmd67]

I've got it all by style 1999 Chevy crew cab dully I'm looking to put a speaker box under the rear seat? I have two shallow mount 12" subs that I would like to use.. now on this model the lower seat part is stationary ( it doesn't fold up) any suggestions? I have four kids that love to Cruz with me so I really don't want to remove the brackets..

 

[wewsel]

Subbed, I have a crew cab, and would like something similar.

 

[Redmd67]

Subbed, I have a crew cab, and would like something similar.

I've been looking around online at a couple of different crew cab options not too many of them out there for our year