It's not possible to know everything the first time around, no matter how much you research it. Sometimes you've got to stop theorizing and just jump in.

The rotors you'd want to use if you're converting a 2WD 5 lug to a 6 lug would be the C2500 front rotors.

I WAS planning on pulling the 6 lug front rotors off of a 4x4 parts truck that I have laying around, I discovered that wouldn't work however. Because:

The 2WD rotors have the lug-studs pressed in, while the 4WD rotors do not. I have the C2500 front rotors laying in my garage for whenver I can get around to swapping the front over, it looks like they will work, I just haven't had time to swap them, and I'm planning on getting some more use out of the front tires.

I have been looking around for wheels for a 88-98 C2500 (since that's what my truck will be "wheelwise" with the 14 bolt and front rotors both from the C2500), but, I haven't had much luck for some reason, I have no idea why? I've looked at summit, jegs etc.

I also discovered that the wheels from a 97 K1500 tahoe won't work b/c they have too much backspacing, the tire rubs just a hair on the leaf spring. My original plan was to use these factory alloys from the 'Hoe, but hey shit happens right?