I have a pair of new old stock, in the box Champion 6 spark plugs available. They are 7/8 inch plugs, 7/8 inch hex. Boxes are intact, fair condition, with wax paper wrappers. Plugs have some light surface rust on the base, but business ends look clean. Not sure what they would fit. Asking $30.00 for the pair, postage in the U.S. included.
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