Before being mass marketed to the U.S. in the eighties, transformers had actually been around for more than a decade in the Japanese market. The first two years of the transformers toy line were actually recolored versions of Japanese molds that came out in Japan under lines such as "Microman" & "Diaclone". Distinct difference between the Japanese lines and the American line are the colors, weapons, faces, and a mini Diaclone driver that would fit in each vehicle. The drivers came with magnetic feet that would hold them inside the vehicles.

Credit goes to Cybertronian Artifacts for allowing the use of his Diaclones for this section.

Cybertronian Artifacts: http://www.angelfire.com/goth/cybertronian_artifacts/