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
Box Two Sealed Integrated Headset (Black) (1-1/8") - Dan's Comp
BLOOKE 1 1/8" 34MM MTB Bicycle Headset 2 Bearing Sealed Top Cap Cover Alloy Mountain Bike Parts For 28.6mm Threadless Fork Stem|Bicycle Headset| - AliExpress
Tech Tuesday - Service and Re-Grease a Cartridge-Bearing Headset - Pinkbike