I got my pocket from the store I bought the wiring harness for my radio from. (long time ago can't remember)
But a radio store would be close, dealer would be another option, or lmc truck, etc...
To get the cd player out. Like 95escahoe said.
Take the dash cover off, (around the gauges/radio) then look on either side of the cd player and raido. They will have a tab on each side you can lift up or push down.
Pull both out, to remove the wires. It plugs into the radio, can't rember if it is hardwired or a plug on the cd player.
Then just push the radio/cubby hole back in.