NBS is short for "New Body Style", its just another way to say the 2000-2006 era of the GM trucks.
OK, that helps, I figured that's what you meant.
So, looking at google for interior photos, that kicked the fog out of that corner of my brain.
Did some installs on those, but they all had the center console. The trucks didn't have the cassette deck down low on the dash, so there was a nice little empty pocket there. I do recall the Icom commercial radios fit very nicely in that spot. I think Icom IC-F621 was what we put in there. Worked out very well.
As always, power direct off the battery. At the time we didn't run these with ignition sense, so not sure where to pull that circuit from on those trucks. Not sure if there was a dedicated feed like the newer models. There's a big grommet under the hood leading in under the dash that we were able to route through.
Coax was routed back around the dash, under that, and up to the roof for a single 1/4 wave UHF whip dead center on the roof. I seem to recall we were able to install them above the dome light to make cable routing a bit easier.
