Re: 1937 KA-37 spark plugs.

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May 23, 2015 at 2:29 pm #16709
Mumbles
Participant

    The D9-J and 5M-J both interchange and the equivalent NGK is A6 or A7.

    Heck, here’s a list of different brands to choose from:

    http://www.sparkplug-crossreference.com … HAMP_PN/D9