Wheel size for 96k1500

Hey everyone, I've visted this site a few times, i finally joined today I know you guys would be able to help me out. I want new rims for my 96 K1500 (the stock ones are pretty tore up) I am looking at Pro comp Xtreme Alloy Series 1023 but im not sure if they will fit correctly, the site says they will but i figured i would ask you first since i am completely stupid when it comes to packspacing and offset and all that important stuff. I would like the tires to fit flush with the fenders or maybe stick out a little. Thanks guys

Part Number: PXA1023-6838

16x8, 6 on 5.5 Bolt Pattern
Backspace = 4 in.
Hub Centric = Yes
Max Load = 2200lbs
Offset = -12mm
Finish = Polished
I was looking at these would this size work? do u know. thanks again

Also I am thinking about getting Nitto Terra Grappler, tires. Anyone have an opinion of these? I have to keep the same rim/tire size (265/75/R16) so i dont void the drivetrain warranty. If anybody can help me find the stock rim specs i can figure this out on my own but i cant seem to find it. I think 4 1/2 backspacing will fit, 4.25 should stick out a little past the fender. Am i correct? Thanks