I had them on mine for a long time until I lost one while trailering the bike. They slip over the end of the swingarm and clamp on to the swingarm with two small screws on the bottom. The only problem is they are difficult to get good and tight. When we put some on my dad's bike we put the sticky backed velcro on top of the swing arm and then slipped the cover over it so when we tightend the screws the two pieces of velcro would help hold them on. They seem to be alot more secure this way.