Here’s a link to a retrospective of Brigitte singing the song, Harley-Davidson. Here’s some information on the motorcycle in the video:

The bike was built by Maurice Combalbert who was a mechanic in a shop located in Paris, selling cars, motorcycles and furniture ! The P.A.M.A. as it was called, mainly sold british bikes, but Maurice – who is a very old man now – was always tinkering around with Harleys. Handmade ape hangers with an eagle in the middle, or with iron initials of the owner, as well as huge exhaust pipes (up to 3 on each side) were his typical trademark. The black WLA he built for this song is certainly the most important bike in France’s Harley history. All old timers know exactly that this Flathead was stolen after they finished shooting the clip, then it was dismantled and the frame and other parts were thrown in the Canal de l’Ourq in Paris. — Charlie Lecach