Long gone from GM. They didn't even offer the production units as a kit, either, so even if you find them, you have to buy everything separate.
You would be searching for 22046433 and 22046434 for the shocks. Monroe Max Air shocks LOOK more like the factory Delco ones, but the connector as you say, is different.
You can get new tiny o-rings for the factory plastic tubes from the aftermarket. Can't recall the size, but I've done this repair before. This is the main culprit of leaks. They're tiny, dry out and don't make good seal.
It's recommended minimum of 25 psi in the shocks with a max of 90 for the factory units. Don't run them flat for too long.
On your 83, they were OPTIONAL. 84 H/O and 85-87 442 the air shocks were standard equipment. If I had to do it all again, and not worry about originality, I'd put some HD shocks back there and call it a day.