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Sump plug o-ring p/n?

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DrunkenWoodpecker

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Lycoming AEIO-360-A1E with factory inverted oil system. Does anybody know the p/n and source of the o-rings for the oil sump plug as in the attached picture? To my surprise it's not a typical round o-ring pictured on the Christen manual.

IMG_1925.jpg
 

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