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This kit GM P/N 12556260 should have everything in it including the pipe. Try GMPartsdirect or ThePartsLadi for a competitve price. It will be $50-$100 in any event.
Have your parts counter guy look up P/N 10108689 it just may be one of the four washers that you need.
You might want to look into some oil drain plug gaskets. That's what I'm running and they are nearly exactly the same dimensions, and more readily available. Not to mention cheaper.
Scott