Hi KB 171,
Any chance you could post a hi-resolution jpeg of your yellow "We support motocross" sticker? I regard them as one of the MAJOR icons of our 1970s MX days, and would love to have one with me. They may not have even had them in NSW (?).
The best one I ever saw was on a white ford ute, circa 1975, and its number plate was MX-400 ... it must have been one of the first-ever personalised plates. Wonder whose ute that was?