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Old 03-07-2018, 11:21 AM
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nograin nograin is offline
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Join Date: Dec 19, 2000
Location: Philadelphia, Pa., USA
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Must be other sources.
This company sells in bulk and says they're also used for spark plugs - or maybe that's just the size and used for O2 sensors or something.

https://www.amkproducts.com/bulk3.asp?part=B%2D10369

I've not come across a spark plug that used a crush washer like that, but that doesn't mean anything.
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