I bought a kit from Nostalgic Air that included the underdash style of AC for this model truck.
A bit spendy at $994 but it should look good when it's done.
The truck was at Roberts house for the DJM kit install so I dropped this off and asked him to install while I was traveling. He said ok! The install went ok, the fittings arrived as shown, Robert ended up at a local shop to get the fittings crimped on once he got the right length on the tubing. The fit on the underdash wasn't a "perfect" fit like it should have been. but overall it looks ok.
This did tax the radiator, and the truck was overheating... so a new radiator was ordered from Jegs and it helped alot.