Check the '59 Speed Twin in my photo posts, or, try this
http://www.vintagebike.co.uk/Bike%20Directories/Triumph%20Bikes/pages/Triumph-Speed-Twin-59.htm

Seems the late '50s, early 60's Speed Twin and T-Bird came with some pretty outlandish arse work. Sort of looks like a scooter. Ugly as sin IMO - but quite unique