Can't be totally sure but I use the Dia-Compe Dirt Harry which should fit a 25.4mm clamp and it uses a removable shim to bring it down to 22.2mm, works well enough too I find but you may find prettier options if you are willing to pay more.
@TONY_M started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Can't be totally sure but I use the Dia-Compe Dirt Harry which should fit a 25.4mm clamp and it uses a removable shim to bring it down to 22.2mm, works well enough too I find but you may find prettier options if you are willing to pay more.