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March 4, 2020 at 5:09 pm
#196662
The 509’s appear to be readily available on EBay…….
https://www.ebay.com/itm/Spark-Plug-Copper-Plus-Champion-Spark-Plug-509/254443926839?epid=223400202&hash=item3b3e0a3537:g:t-UAAOSwr6deVjBy
Prepare to be boarded!