Amazon.com: License Plate Helmet Security Lock with Mount Left & Right Side Anti-Theft Helmet Lock Universal Fit for Motorcycles with Flat Brackets : Automotive
HELMET LOCK
Lockitt Mobile Security & Accessories: Universal Helmet lock for 7/8" 22mm Bar
LYUMO Metal Helmet Lock,Handlebar Helmet Lock,Universal Motorcycle Helmet Lock Anti‑Theft with Keys Riding Accessory for 0.9in Handlebar - Walmart.com