15sd Posted September 25 Share 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 box plus actual mailing cost. Steve vintagetin1@sympatico.ca Edited September 25 by 15sd addition (see edit history) Link to comment Share on other sites More sharing options...
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