Hello Jack,
I don't have the photos with me but the answer to your question is, it's not a bolt on. However, I took the best of the info I got from the internet and made a combination that I hope will work well.
I bought a set of hubs and abutment brackets from a guy (I apologize don't have his name with me either) that's probably on this site. It's the setup where you start with a rotor and cut the rotor off and use the hub. The parts were nice, hubs came with seals and new lug studs and the price was friendly. They were painted black, I had them powder coated silver.
There is a fair amount of work that has to be done to the spindle. Wasn't overly difficult but more slow as you measure and remeasure instead of "cut it twice and it's still too short". I think I have some decent photos I can post once I get back from Denver.
Here's the kicker, I can't say for sure about the wheels that everyone else is running, I can't really even speak to 16 inch IROC front wheels, but I know for certain that IROC rear wheels will not work without a spacer/adapter. The 5.25 Backset allows the step on the inside of the wheel to rub on the caliper cooling fins. Beyond that, the outside edge of the wheel rubs on the tierod end. 3/4 of an inch in spacers gets you a 1/4 from the tierod end. Remeber, this is with a rear wheel on the front which is what I want to run.
The IROC rear wheel on the rear put the tire about a 1/2 an inch from the frame with a fairly weasely tire installed. So, I'll be running made in the USA billet one inch spacer/adapters front and rear. My spindles are S10 but I think every lowering spindle you can purchase can be used on either a G-Body or an S10 application.
I think the chrome 16 or 17 inch IROC wheels would work in the tierod end area as they only have a 4.5 inch backset. I'm really not sure if there will be a rub on the caliper cooling fins, if the wheels have a step like the stock IROC wheels do, then it's propably the same rub.