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If Seventyiron has a 1972 with the infamous plug, then that was the first year. A 1971 and earlier does not have the plug.
As a side note: The 1970-1974 Factory Service Manual has no mention or pics showing this plug. You would expect to see at least a pic of this but it does not exist......
pg
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Rolling down the highway on two wheels since 1957...
Owner Red/White 1971 XLCH & 2003 FXDL-Silver over Black
"Miles are kept by how many times you fill up"
