thanks c4, I think they fit good, was surprised how easy my cab bolts cab out. Good thing I took them out too, the DS were thin, like maybe 1/4 thick on one spot due to rust. They are around 1/2 thick normal. I used impact on them but turned out to be 15 mm and not 18 like I bought, couldn't find a 15mm 1/2 anywhere, besides 12 point, so I used it, PS came out fine, DS seemed to be rounded or socket was, so I used a 3/8 15mm and my ratchet just used my jack handle on it, they came right out. I then proceeded to spray the guts out of the cab holes with some lube, did the bolts the same way, bars came with new bolts luckily. They fit good no issues, better then my front bull bar it had to be worked on to fit right.
I don't think I saw your gmc c4 got pics of it?
PS
I should have some pics of a nice surprise I been holding back tomorrow hopefully if all goes well. If not then I'll let ya know what it was going to be. It aint tires, done got them, just aint on yet. You guys will like it though, I think everybody will. I know most hate my truck or hate chrome but this aint chrome and I'm sure tons will like it LOL.