How To - Order Replacement Bike Lock Keys - J.C. Lind Bike Co.
Schwinn Anti Theft Bike Lock, Security Level 4, U-Lock, Keys, Black : Amazon.sg: Sporting Goods
What to do if you've lost your bike lock keys - Stolen Ride
ValueMax Bike Lock - 16mm High Security Bike U Lock, with 1.8m(6FT) Security Bike Cable, Heavy Duty Cycle D Lock and Mount Holder, for Motorcycles/Scooters/Bicycles/Door : Amazon.co.uk: Sports & Outdoors