I did all the steppers and bulbs in my 2006 cluster. Also did the bulbs in the dual zone/automatic ("digital") A/C panel, and the steering wheel buttons. IIRC the digital A/C panel has two different types of bulbs in it, 12V and 6V
The whole reason for this job is my fuel gauge stepper went bad during a battery cable replacement. Figured since they're known for failure I did the whole thing.
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This is the kit I used for my 2006 SS since it has the extra stepper for the transmission temperature:
https://www.amazon.com/gp/product/B01J50FOBA
These are the "grain of rice" bulbs I used in the steering wheel buttons:
https://www.amazon.com/gp/product/B00L8BR76A
And finally here's the climate control bulb kit; note that you have to pick auto or manual on the controls as the bulbs are different:
https://taninautoelectronix.com/product/2003-2006-gmc-chevrolet-truck-diy-climate-control-bulb-kit/ - I wish I could remember the information source I used to determine which bulbs were which. There's two circuit boards in the controls IIRC...sorry; don't have pics of doing that one, but it really wasn't a big deal.
The only real PITA is the replacement bulbs for those small ones in the buttons and A/C controls don't come with the blue covers that give them the correct color; you have to carefully pull them off the old bulbs and transplant to the new. Sometimes they're crispy which makes it tough.
Richard