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AFAIK it's not a factory stripe. There were several companies that offered strobe stripes to dealers to add to their cars. In addition Mopar Accessories offered a body length strobe stripe in 1974, so maybe they the offered what you saw for 1971.



There are many stripes which may appear to be "factory" but are more likely "dealer".

The below is from a factory brochure, but no such striping was ever offered from the factory.