Pro one turn signal bars fit between the forks and mount to the headlight mounting bolt.Machined from billet aluminum.Come with elliptical amber lenses.Wide glide version measures 8-1/8" x 3/4" x 1-1/2.Narrow glide version measures 5-1/4" x 3/4" x 1-1/2.Load equalizer required to properly control the signal action on most models.