Those are sealed beam replacement headlamps.
It makes no sense to try and retrofit them into a Yukon because it'll cost just as much (if not more) to instal them and the output will just be a white version of your existing output. Also, because they are stand alone lamps there's no real way to fasten them to a reflector. Plus you'd not only have to open up your Yukon headlights, you'd also have to open the GE ones so as not to have two cover lenses.
If one is going to go through the trouble of opening lamps and retrofitting something into them, then it makes more sense to use HID projectors.
---------- Post added at 08:26 PM ---------- Previous post was at 08:22 PM ----------
On a side note, those 4.5" lamps, provided one can find a way to mount them, look like they might be a good application for the NNBS fogs:
http://www.gelighting.com/LightingW...Nighthawk-Headlights-Sell-Sheet-July-2013.pdf