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https://www.jdfanatics.com/threads/s...nce-chart.144/
Here's a cross reference chart showing the AC600R JD part#. Third one from the bottom on the right under JD part #'s. Shows it crosses over to a Champion W18, which is an 18mm plug. Fits many antique 2 cylinder JD tractors, but will also work great in a Model A. Good catch, Gary.