Try this
https://www.i-ride.co.uk/Campagnolo-KIT-200PR-Spoke-Mini-Kit-28-Proton-Clincher.aspx
Also I had some proton wheels repaired using DTswiss spokes some years ago
@MRI 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.
Try this
https://www.i-ride.co.uk/Campagnolo-KIT-200PR-Spoke-Mini-Kit-28-Proton-Clincher.aspx
Also I had some proton wheels repaired using DTswiss spokes some years ago