Amazon.com : Farbetter 1-1/8" Heavy Duty Headset Top Cap Bearings, 34mm/ 44mm Diameter Threadless Stem Tapered Sealed BMX Bearing Nuts (34mm) : Sports & Outdoors
Bicycle Headset Bearings, Tapered to Straight Tube Headset Replacement Mountain Bike Headset Kit for 1-1/8in or 1-1/2in Tapered Tube Forks and the Front Fork Standard Cone Tube Straight Tube General : Amazon.co.uk:
Works Components Bearings - Tapered Steerer Tube Headsets - Fanatik Bike Co.