The easiest way to do that, if the parts don't come with specific o rings already is to match them up. Most shops that do AC work will have a large box with a wide variety in it already, but if you're doing it yourself, be sure to call around to auto parts stores in advance,and see if they sell the o'rings individually. It is not good to leave the system open for more than 10 minutes, unless you're putting a new dryer on it,which you are so that's okay. Just take a nitrile glove,cut the finger off,cover the tubes coming out and tape everything up as good as you can, then you can drive your car to go get the o rings if you need to. Just be sure to get green o rings that are an exact match, and pull a good vacuum for at least 15 minutes if not longer before you put the 700 grams of freon charge in it.
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