It's still possible in 2021 !
Today I visited Earnhardt GMC in Mesa, AZ who successfully obtained the VCI codes needed to add the RPO code UK3 to my 2005 Silverado LS. I now have a fully functioning DIC (aside from instant fuel mileage) and radio controls !!!
Since this mod is kind of dated, I expected prices to be higher than previous posts. So here is what it cost me in 2021:
Clock Spring (I installed) $215.72 from GMpartsonline
Steering Wheel (I installed) $180.00 from eBay
Programming $232.56 Earnhardt GMC
You might ask yourself