what adapter kit?

[whitetrash]

for a double din radio in a 04 gm truck?

[VaderTT]

I have a Silverado that year and it came with a double din factory radio.

[whitetrash]

its slightly larger than double din if recall correctly. and the kit is required for an aftermarket unit

[VaderTT]

I got mine from EW with my stereo I guess.

[EW]

for a double din radio in a 04 gm truck?

If full size Sierra...
Best Kits BKGMK422 or Metra 95-2009

PAC C2R-GM24 is the proper data module that retains chimes and RAP (retained accessory power) features. You can use a Metra 70-2003 or BHA2003 but you'll have to run an ign lead.