No chance. There was no z71 3/4 tons or 6 bolt 2wds
Yes and no. Definitely no Z71 3/4 tons (at least in GMT400 series), but there are of course the C2500LD 2WD's with the 6 lug 9.5" 14 bolt.
So the problem is there are two different widths of 6 lug 9.5" 14 bolt, the narrower one from the C2500LD which is what you would want to swap into a 2WD truck, or the wider one from a Z71 optioned with the 14 bolt...which would suck for a 2WD, too wide.
I forget the measurements off the top of my head but do some searching, or simply go measure the width of your existing rear from wheel mounting surface to wheel mounting surface, then go measure the seller's, and you'll know. It's like a 3~4" difference between 2WD and 4WD.
But yeah, main point is, seller has NFI what he's talking about so the best bet is to measure the thing yourself so you know what it really is. My guess will be it's from a Z71 with the F44 suspension package meaning it came with the 9.5", this is still a K1500, not a 3/4 ton.
Richard