Sierra Back Seat

Anyone put 12" subs under the back seat of a Sierra/Silverado and still be able to have the seat and leg room on the floor? Pics if ya got em.

what year is it?

01 extended cab. 4 doors. Not a crew cab.

I was looking into the same thing you are talking about and had found these, dunno how good they are, as I have not purchased them.
http://www.cardomain.com/item/QLCQLC1GTX11080
Good luck.

Probox makes 1 part #99X212DF
website
http://www.proboxrocks.com/products/enclosures/unloaded/chevy/99X212DF/index.shtml

Do what Neal said, makes it custom, and actually matches ALL the contours.