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Commercial versions of the promos were also marketed and sold in retail stores like Zayre and Murphy USA from the early 1960s, up until around 1973. Differences from dealer promos were lack of manufacturer's official paint schemes and often the addition of a friction motor located on the front axle, noticeable by the studded white vinyl gear that protruded around the axle (and through the oil pan). However, they were painted and looked just as attractive as dealer promos.[citation needed]