I just got an H3 at
ARMEN, and they accepted the GMID. Though, when the car came in that we wanted (from Scott), it had a different interior than we ordered, and the car has a leaky headlight and broken roof trim.
I have to say, in PA,
SUTLIFF, MECHANICSBURG might be one of the better dealers. They are pleasant and will accept GMID. Wish I had gone there instead of ARMEN, personally, but originally ARMEN was going to take off $1,800 vs. $0 at SUTLIFF so I went with the former in case I couldn't get a GMID.