PAD's are tough to come by. I've seen some sections, but never a complete book for our trucks.
I've got a couple pages form the tailgate area for an 88.
PAD's also vary alot from year to year and even during the year, even depending on what plant the vehicle was built in. I used to do PAD's for S10's too, and produced a slightly different set for a plant in Brazil and the Plant here due to space and layout differences some stations were condensed.
I'm sure they exist somewhere, that vette one looks like someone bought the rights for reproduction from GM, probably only done on very popular models. I've never seen a reproduced set for our truck.
The pages I got from my father a long time ago, who used to work (retired now, 35 years!) at GM.
If they are not reproduction, they are somewhat rare, a plant usally only had a few sets, and some would post the pages at each station, other than that, GM has some for archive but probably ditched them for our era vehicles already. Parts books were sent to every dealer in the country, that's why those are so readily available.
A reproduction set may exist, I've never went looking for one, but I've never seen it either.