The factory "kits" Had everything except the R-12. I had to supply that. When done, you could not tell the difference, from factory installed, unless you were an expert.
The imports were the easiest to do, and as far as I know, every brand had the factory kit. Mopar and Ford had dealer installed kits available, but some were a real bear to install. I never saw a GM factory/dealer kit. So I am under the impression Gm never made a "kit". However, the aftermarket had just about every GM vehicle covered.