Classic Motorcycles and the "Fonz"

Classic Motorcycles and the "Fonz"

One of the best known situation comedy shows “Happy Days” which is still showing as repeats in various countries of the world, is still to this day an all time Classic TV. Show.
The leading character known as “The Fonz” (Arthur Fonzarelli {Henry Winkler}) dressed in iconic leather jacket, tight jeans and that white T shirt, rode a Classic British Motorcycle or three in the series. If the series was repeated in Australia. or U.S. today, only bike heads would notice the change in motorcycles and models used on the show.
The show Happy Days, was most popular towards the late seventies and ran for a staggering 11 seasons. (1972 the pilot, to the series end in 1984).
There were conflicting opinions as to what motorcycle he had from show to show. For example, the Happy Days Picture Gallery had him next to a Harley Davidson Sportster motorcycle and the in later episodes, a pre-unit 500 Triumph Twin (more on this later) and even a B.S.A. motorcycle.
Google Groups thought that one motorcycle was a Triumph, unspecified model, and the other a Harley Davidson Knuckle Head (doubtfull, because of the size) and not a Harley Davidson Sportster (more likely) So where's the evidence, it seems however, the Fonz was a man of many.....classic motorcycles, some even went so far as to name him “the father the son and the wholly Fonz”, of Fashon, Television, and Classic Motorcycles.