Amazon.com: Kuryakyn 4248 Motorcycle Accessory: License Plate Helmet Security Lock with Mount, Universal Fit for Motorcycles with Flat Brackets , Black : Automotive
Amazon.com: YHMTIVTU Helmet Security Lock Universal fit for Motorcycles with 7/8" to 1-1/4" 25-32mm Tube Black : Automotive
Amazon.com: Kuryakyn 4619 Motorcycle Accessory: Tamper-Proof Helmet Security Lock, Universal Fit for Motorcycles with 1-1/4" to 1-1/2" Diameter Frame Tubes, Gloss Black : Automotive