Rizoma Proguard & Bar End Mirror Adapter LP321
Fits handlebars with a large thread inside - the inside of the handlebar is threaded
(your stock bar ends would have unscrewed from the handlebar)
LP321B is a double threaded piece of aluminium - it screws into the handlebar, and provides the correct size thread for the Mirror or Proguard.
All Rizoma Bar End Mirrors and Proguards are universal - adapters are required to fit them to your motorcycle