6pcs Bicycle Fork Washer Bike Headset Adjusting Washer Dust Cover Fine Tuning Washer 0.3/1/2/3mm Spacer Gap - Bicycle Headset - AliExpress
Hammer Headset,1-1/8" 34mm I.D. Headtube, With forged and CNC machined crmo cups and oversized 1/4 inch bearings in the lower cup, this headset will not let you down By FSA - Walmart.com
Shimano Gap Cap & Expander for Carbon Steerers (Short) (UD Carbon) (1-1/8") - Performance Bicycle
FSA cockpit integration expands on & off-road, plus more KFX for mountain bikes - Bikerumor