Drilled and tapped the heater fitting and added repair fitting to rear evaporator on the 95 burb I'm redoing.
Heater fitting was the third one I've done so it was not bad.
The Evap repair had me pulling out my hair looking for fittings I'm Using Dorman compression fitting and Dorman 800-9961 Dorman 800-963 female o-ring tube ends but the swivel nuts are Unobtainium. I saved the 5/8 nut and reused it but I cut the 3/8 nut to save the $53 tube to the expansion valve. Got some of the seen on TV aluminium low temp brazing rods from Harbor freight and brazed the end to the factory tube.