I purchased a set for my 06 Chevy 2500 and it took 45 minutes to install both,it's pretty easy.I got power,heated but with the yellow LED blinker on the outside of the housing,they were a little cheaper than the ones with the blinker in the mirror.I got mine from 1A Auto.
Camping Couple,dealers are not the brightest when trying to get info,i got the same story from them about mine but the harness was exactly the same and I had no issues,however if you have just power mirrors with no heat or blinker and buy ones with them it wont work,you will need to have the BCM reprogrammed.
06 2500 Duramax. Air lift 5000 air bags,Equalizer WDH, EFI live,fass fuel system,4" straight pipe
2015 Jayco Eagle Premier 314BHDS
IBEW local 94 Electrical Worker