So I've been trying to search and search on this.
It seems there are some common projector upgrade packages for the K2XX Silverado's and Sierras and some vendors that make mounting bracket conversion "plates" to make projector retrofits easier on certain GM SUV/Truck headlights. Some projector swap/upgrade kits that are actually doable without even opening up the headlight!
This video here is a couple years old, but you get the idea and can see how much room from the back with the headlight cap removed there is to work with on the K2XX Sierra and Silverado headlights:
Other than the brackets to convert the bolt pattern it seems pretty straight forward. Especially like the idea of not having to open up the headlight.
Reviewing the back of a K2XX Yukon headlight, the opening for the low beam projector seems a bit smaller. I'm not so sure the same projector swap/upgrade would be doable without opening up the headlight? The project may be too large to come out of that back opening and the new one may be too large to go back inside.
This is the back of a non-Denali Yukon Halogen low beam projector headlight
I did purchase a broken "for parts only" Yukon OEM halogen headlight off eBay to play around with. My original intent was to bake it and open it up to see what the mounting bolt pattern was for the OEM projector to see what Bi-LED or Bi-Xenon projector would be the easiest swap.
But then I found the video above and got a glimmer of hope that maybe an upgrade could be achieved without even opening the head light.
More to come...