taco eater :
Darren Brown from Oakland, CA United States
If you have a euro Vespa Si, the original round horn will not fit this unit unfortunately. It will fit on the other Domino brake lever assembly that is made of metal. Found out the hard way... Otherwise, it's a great throttle and its matching sibling made an awesome upgrade when the stock Domino original right side assembly snapped when I hit a taillight (whoops!). There's a kill switch made to fit the throttle side made by Grabor sold here on Treats.