In the manual section there is a 1960 manual posted that shows the exploded view of the kickstarter. It references the pedal cover(#1968) but does not show it in the illustration. Take a look.
Tom, I just went and looked in some of my other manuals, and that cover, part # 1968, is listed as far back as the Simplex 125 manual, dated August 1, 1953.
Great catch to both Mike Sal and Tom!
Mike, where is that picture?