there is a reason that ALL of the pwc manufacturer's recommend (and even put stickers on that engine that tell you to use) NGK.
some things just arent worth saving a dollar over.
measure the distance, on center, between the two bottom bolt holes (the ones under the "2" and "0") in the pic.
the 6m6's are further apart from each other than the 61x's.
if you can provide the measurement, i can tell you what its for.
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