Here's just one example. I have no experience with this brand so can't comment on quality. Scroll to bottom of the page if you want slightly taller versions.
1-1/8" OMNI Racer WORLDS LIGHTEST Integrated Headset Conical Carbon Spacer 10mm | eBay Yes it's difficult to find the proper search term but I had the best luck with this.
"Integrated Headset Conical Carbon Spacer" or leave out the
Carbon if you prefer.
Last edited by Crankycrank; 02-23-21 at 10:34 AM.