Here you are
https://www.ebay.co.uk/itm/NOS-WEIGHT-for-MAVIC-COMETE-CARBON-REAR-WHEEL-ROAD-PISTA-TRACK-VINTAGE-1/302844403805?hash=item4682eee05d:g:o7QAAOxyXWdQ79Qj
I think at my parents' house I may still have 2 lengths of the corrdct width rod to make these if you can get them cut. I also have an original removal magnet.
@Stevep4 started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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Here you are
https://www.ebay.co.uk/itm/NOS-WEIGHT-for-MAVIC-COMETE-CARBON-REAR-WHEEL-ROAD-PISTA-TRACK-VINTAGE-1/302844403805?hash=item4682eee05d:g:o7QAAOxyXWdQ79Qj