I would use a copper crush washer from a banjo fitting. I've used the plugs before and always use a sealing washer, especially if it's upstream of the O2 your using.
If you can't find one, you could grind down the threads on a spark plug and slip the crush washer off. It's the same size as the plug.
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Craig Scholl
CJD Automotive, LLC
www.CJDAUTOMOTIVE.com
"I own a Mopar, so I already know it won't be in stock, won't ship tomorrow, and won't actually fit without modification."
Last edited by CJD Automotive; 10-11-2016 at 05:24 AM.
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