The o-rings used for the oil separator tubes are the same ones used for the dipstick. You can order them on Fastlane. It's also worth mentioning that when you search for "breather hose", you get two results... one with a picture, one without. I don't think they're the same part. I ordered the one with no picture, and it turned out to be the connector for the oil separator end of the hose. I'm pretty sure the one with the picture (Meyle brand) is the one that sits on top of the valve cover. Hopefully this saves someone from ordering the wrong part!

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1985 300DT, Classic White, California, 175K
1984 300TD, Classic White, Euro, 285K


"When nine hundred years old you reach, look as good you will not. Hmm?" - Yoda