15sd Posted September 25 Posted September 25 (edited) " Fire Ring" ( four equal sized green rings ) I believe correct for many GM, Chrysler etc. 1959 to 1977 which used the plug with four rings of the same diameter. 1978 seems to change to upper ring wider than the others. $20 ( box of 10 plugs ) in original boxes in box of ten plus actual mailing cost. Steve vintagetin1@sympatico.ca Edited November 11 by 15sd addition (see edit history)
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