The Chevy and GMC units are that brownish black color, and the Escalade ones are a lighter tan ish color. Not sure about the Denali ones, if they're like the Escalade ones. Last couple Denali's I saw in the yards, the columns were busted up....
It's hard to find these that aren't cracked, between vehicle break-ins and the difficulty of getting the parts off for repairs to the column or switch replacement. The ones on my Burb are cracked, and I think the spares on my parts shelf are cracked too, just not as bad. I've tried to get a couple pairs of trucks in the yards but gave up. It's easy to crack them if you don't take the wheel off, and even on a truck in the yard that could be dangerous if the airbag module decides to go off.