BuyBits Original Extended Bike Handlebar U Bolt Base with AMPS Plate for Garmin Zumo 660 660LM (sku 20227) Includes 4 hole AMPS adaptor for the TomTom Dock (Dock not included) FitsFits Garmin Zumo 220, 350, 400, 550, 660, 500, 220LM, 340LM, 590LM, 660LM, 350 LM and 390LM GPS systems. Metal U Bolt handlebar base includes 2 x U-Bolt's and 2 x reducing collars and fits bike / motorcycle handlebars from 16mm to 32mm. Extension arm 3" length (7.62cm) between centres. 1" double socket fits all 1" ball mount bases including RAM Motorcycle Mounts and Ultimate Addons. The 4-Hole AMPS pattern consists of four holes located in a rectangular pattern spaced at 1.188" by 1.813 - Fits Rider dock - Dock not included. Includes 1x Buybits Original 1" Ball Amps 4 Hole Adaptor 1x Buybits Original Extension Arm 1x Ultimate Addons Metal U Bolt Base