EUREKA!!!!
Go to Fastlane, Year, Model. Etc, Climate Control, O-Rings. The middle o-ring there is the metal type for R4 Non-Stepped Ports. If you use the large brass o-ring that came with the compressor kit for the large port and this o-ring from Fastlane for the smaller port, it looks like it will be a great seal. These o-rings are the exact same height. They are a little too tall but the manifold line bolt only takes about 30nm. I don't think that will create any distortion on the manifold line. There will be a small space between the compressor and manilfold pipe which the instruction sheet says no problem. I am going to proceed with the installation this weekend and evacuate and charge on Monday of next week. I'll keep you posted. Have to agree about this being real PITA project. Make wife has been sending up smoke signals the past few weeks as little progress has been made. Maybe after the A/C starts working she'll COOL off a little bit!