I saw these mirrors at Amerivespa and decided I had to have them on our scoot. It was a very easy upgrade to do and took about a half hour. Step 1. Slide the rubber gromet up the post of the OEM mirror. 2. Remove the small allen screw and plastic cover at the base of each mirror. 3. Take a 17mm open end wrench and loosen the lock nut then unscrew the mirror post from it's mounting hole. 4. Drill out the mounting hole to the size needed for the new mirrors. The tap and die set usually has a conversion chart on what size hole to drill. 5. Thread the hole using some cutting oil. 6. Put the rubber gromet on the post of the new mirror. Replace the cover and allen screw and screw in the new mirror. 7. Slide the rubber gromet down and that's it. Adjust and ride with a smile.