07 impala install question

Im doing an installation for a buddy on an 07 impala that was used as a police cruiser. I'm having trouble figuring out how to get the 6x9's outa the back deck. They only go up, they won't drop into the trunk. The grilles seem to be "part of" the whole cloth deck piece. The seats were made stationary so they won't fold down cause it was a cop car. So, any ideas?

pull the bottom back seat out. under it you look for bolts holding the back section down. pull that and the rear deck should pop out you may need to pull the c-pillar panels.

Thanks a lot. It'll be friday before i get another chance, but hopefully that'll do it. Talk about a pain in the butt just for 2 speakers with grilles right above em. Stupid new GM