Delco/gm OEM CB radio

[72pnwblazer]

I’m looking for more info about the OEM Delco/Gm cb radios. As far as I’ve seen they were available from the early 70’s thru the mid 80’s, 86ish. I picked up a stand alone unit off eBay, that plugs into the radio harness and have it in my 86 C30 dually, but I’m unsure where they were mounted from the factory/dealer. If anyone has any photos of where their OEM cb “brainbox” is mounted, that would be awesome!

Added photos are the cb mic and “brain box”