I have gotten together the part numbers for the o-rings and compressor seal p/n for the a/c system on the 123/126 cars. I'm sure these seals are used on other applications but I am not aware of them at this time. The metal ringed seal that seals the manifold hoses to the AC Delco compressor are AC Delco "kit" number 15-20058. The MB part numbers on all the o-rings that are used for this application are:

140-997-09-45
140-997-08-45
140-997-07-45
140-997-06-45

Sorry, I do not have the quantity needed. I usually just get a handful whenever I need some.

Hope this posting helps someone trying to rebuild and a/c system.

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Jim