Phil, your work here is incredible! After reading 116 pages and remembering 4 or 5, here is what is distilled for my 2018 Silverado 2500HD LT Duramax with DL8 and K40. The prices are the lowest I have found online.
Chevrolet upgrade path: Mirrors, Trailering, Black - GM (23372182) $487.50 or Mirrors, Trailering, Chrome - GM (23372181) $565.50
Features obtained: Power mirror, turn signal, running light, cargo light
Features lost: Heat
VEHICLE
BODY
“AS BUILT” RPOs
Install Driver Door Harness
Install Passenger Door Harness
Need Camper Mirror Harness Kit? “RZY”, P/N 23387133
BCM Cals
Memory Module Cal
2016 LD & HD
43, 53
DL8
23171572 $65.48
23171566 $55.83
NO
YES, for Chevy HD
NO
2016 LD & HD
DL3 A45
23171564
$66.47
23171567
$57.20
NO
NO
NO
Mirrors, Trailering, Chrome - GM (23372181) $565.50 Two more years’ warranty
GM (23171572) $ 65.48
GM (23171566) +$ 55.83
$686.81
Discoverd that these mirrors are not heated: GM Partech line!
or
AM Auto Parts AM-4039565055: Features obtained; Temperature Sensor in Passenger Side Mirror with RPO Code K40 (Diesel Exhaust Brake) Power Heated Smoked Lens LED Turn Signal & Light Bar Side Marker Memory LED Spotlight Upgrade Puddle Light Power-Folding Chrome Manual-Telescoping Towing Mirror Pair
AM-4039565055 $566.99 Ten year warranty
pgamboa DIY harness $ 90.00
Mirror switch $ 70.00
$726.99
or
1A Auto Parts 1AMRP01798: Features obtained; Temperature Sensor in Passenger Side Mirror with RPO Code K40 (Diesel Exhaust Brake) Power Heated Smoked Lens LED Turn Signal & Light Bar Side Marker Memory LED Spotlight Upgrade Puddle Light Power-Folding Chrome Manual-Telescoping Towing Mirror Pair
Part #: 1AMRP01798 $624.95 Lifetime warranty
pgamboa DIY harness $ 90.00
Mirror switch $ 70.00
$784.95
I believe the AM Auto looks like the best bang for the buck at this point, although the GM certified is an awfully tempting route.
Thanks again! Any thoughts are welcome.
Paul