Late to the party but if for some reason the p-clips don't workout, have used these seatpost clamps with sucess..
https://www.sjscycles.co.uk/seat-posts/mpart-seat-clamp-with-rack-mounts-for-318-mm-diameter-seat-tubes/
Thanks, that looks like it would work if I turned the rack stays upside down. P-clips were only £3.99 though and seem pretty rock solid.
@pjay started
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Late to the party but if for some reason the p-clips don't workout, have used these seatpost clamps with sucess..
https://www.sjscycles.co.uk/seat-posts/mpart-seat-clamp-with-rack-mounts-for-318-mm-diameter-seat-tubes/