Your search for "handlebar clip-on" revealed the following:
SCRAMBLER DUCATI DESSERTX Urban accessory package 97981183AA
$1,311.06Maximum riding pleasure and practicality during your daily travels, whether in town or in medium range touring, thanks to this...
BSRA50D - ADJUSTABLE HANDLEBAR GP d. 50 MM. OFF SET 15 mm.
$300.67Possibility to vary the inclination of the tube 6 to 10 degrees, the bracelets and the handlebars are wholly obtained...
Variable section handlebar (_ 22-29 mm/H 55 mm)
$135.60Variable section handlebar (_ 22-29 mm/H 55 mm) MA009G
Variable section handlebar (_ 22-29 mm/H 30 mm)
$135.60Variable section handlebar (_ 22-29 mm/H 30 mm) MA006G