I purchased a compressor for my 84 300D, waiting to hear what year it came off of, and it a Delco 1131350. I'm down to connecting the HS/LS lines to the back of the compressor and ran into an issue.

The seals for the lines to the compressor differ. My old compressor had a step/recess for the seals. The kind that id you search for you can find easily. The new/used compressor appears to be made for large o-rings.

Does anyone know the o-ring size/number so I can procure one?

the 240 a/c manifold thread has JUST that information in it!
http://www.peachparts.com/shopforum/diesel-discussion/316858-c-manifold-saga-240d.html

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Thanks, but I don't think I received what I needed. My o-rings came today. (Off post 32 on this thread http://www.peachparts.com/shopforum/diesel-discussion/281479-getting-ready-get-ac-working-3.html)

They don't appear to be fat enough. There is a chance they are but I don't want to open my receiver drier for an evak to find I need other o-rings that I have to wait on while the system is "open"

Does anyone know which o-ring?

I decided to give the rings a try and they work. Thanks vstech.