https://www.sjscycles.co.uk/frames/m3-x-40mm-dropout-adjuster-screws-per-pair/
or
https://www.sjscycles.co.uk/frames/m4-x-30mm-dropout-adjuster-bolts-per-pair/
maybe?
Bingo!
@JurekB 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.
https://www.sjscycles.co.uk/frames/m3-x-40mm-dropout-adjuster-screws-per-pair/
or
https://www.sjscycles.co.uk/frames/m4-x-30mm-dropout-adjuster-bolts-per-pair/
maybe?