RV2 plumbing question

So I'm in the process of replacing the O-rings on my a/c system ('69 300) when I hit a snag at the discharge line, leaving the compressor.

When I took it apart, there was an o-ring, but no flat gasket.

The fsm shows a flat gasket, but no o-ring at this juncture.

The kit I received for Original Air Group has both an o-ring and a flat gasket.

I believe an o-ring should be used as there is a recess for it but do I use the flat gasket as well ?

Normally I would defer to...

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Author: 5wndwcpe