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Old 03-07-2018, 11:21 AM
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nograin nograin is offline
304 AMC
Join Date: Dec 19, 2000
Location: Philadelphia, Pa., USA
Posts: 2,057
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.

I've not come across a spark plug that used a crush washer like that, but that doesn't mean anything.
'85 Grand Wagoneer
360 727auto, NP229
body by beer (PO)
carries wood inside
no "wood" outside
My other car is a fish
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