My cd thingy was in that pocket. I took the 'pocket' out and was able to use the bracket with the cb without hole modification- they lined up fine for me. It is a tighter fit, especially in the back (which is why the 'L' connector-the trim on the 96 didn't want to fit back on nicely with the cb out that tiny bit too far) that it didn't slide around much and that might have been fine but I used screws anyway. Didn't want it coming out over the bumpy stuff.
To run the cable to the back I used 18' coax to the passenger side and ran it under door sills and interior body panels to the right side taillight. Through the wiring boot behind the taillight and originally down to the antenna mount. This would work for either side.
I later moved the mount to above my taillight and the cable with it but that's another story.
I also ran an aux. fuse block in the engine bay by the battery for separate power. Shuts off when key is off. Still get some interference though, usually with the electric motors (wiper, window) but not much.