IIRC the bulbs are soldered in if it is a GM cluster. If it is, you will need to unsolder the old ones and get new ones. I had an 03 Silverado that burned out a few, replaced them with these CLICKY.
2007 Fleetwood Excursion 40E Cat C7 350 HP
2007 Chev 2500HD D/A Long bed CC
2011 Toyota Tundra
Gone but not forgotten, 2008 Jayco 299 RLS