It's a quick ratio box I'm told, which I believe is standard on the Z's, but probably optional on other 69's.
I have OEM stuff here I've pulled from parts cars. My issue with using that stuff is that, for starters I'd have to buy new lines anyway, I'm not using 45 year old lines. I'd have to rebuild the PS pump because again, not comfortable just throwing that on after sitting in the box for 30+ years, and the 3 steering boxes I have would likely be okay but never know, then I'd still have to buy the deep groove pulley, odds and ends clips etc... So I decided it made more sense for me to just buy a new kit with all new parts. Really don't care about it being repop. The pulley's I've seen are so good repop now that it takes an entire review board to even determine if it's an original or not, lol. The brackets look just like the OEM brackets I have in a box, pitman arm has cast part number on it and looks pretty good, but with that being buried down in there with the steering box and hardly seen, it's not much concern to me.