I used one of these on my ST4S
http://www.bike-gizmos.com/bikegizmo...izmo-Flyer.PDF It is better made than the one on ebay as all the fittings are Ducati style (not bullet connectors).
Price is around the same as the one on ebay. (couldn't get a price as their on line store is down)
http://www.bike-gizmos.com/bikegizmos/index.html