I'm curious--how can it be known that an elastomeric front bumper was never factory installed on a 70 challenger?

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A long time rumor.......although not "impossible", has never surfaced, about the only "Factory" 70 with elastromeric bumpers from back in the day was the Yellow Jacket, long before it was converted into the Diamante,....as to the origins of the bumpers? factory installed? who knows unless you were there?, factory supplied?...I would think most definately

As to a production 70 Challenger leaving the dealers lot so equipped,...possible

As to a RPO,.......not until 71