Amazon.com: Motorcycle Helmet Lock, Metal Motorbike Helmet Lock Motorcycle Safety Lock with 2‑Key Metal Small Portable Universal for 22mm Handlebar : Automotive
others: motorcycle helmet lock chrome fit for 7/8 inch handlebar lever/brake clamp
Universal Motorcycle Helmet Lock Anti‑Theft with Keys Riding Accessory for 0.9in Handlebar - Walmart.com
SATO RACING | Helmet Lock - Universal Handle Bar mount type
22mm 7/8'' Handlebar Mount Helmet Lock Universal For Motorcycles – GIDIBII
Amazon.com: Motorcycle Helmet Lock, Electric Bike Hook Lock Security Metal Padlock 2Keys for 0.9‑1.1in Handlebar Universal : Automotive
Amazon.com: Motorcycle Helmet Lock Fits 1" (25mm) Handlebar Anti-Theft Helmet Security Lock with 2 Keys Fit for Motorbike Scooter Street Bike : Automotive