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Thanks for that info, looks like this is the correct chainring bot set for my cranks.
https://thecycleclinic.co.uk/products/campagnolo-ec-at300-chainring-fixing-bolts-for-power-torque-double-chainsets?_pos=2&_sid=fe9140530&_ss=r
They are sold out but paying £44 just for a spacer would be insane! I will send them an email and see if they have something that would work. I would imagine that the spacer across all those sets is probably the same dimensions but you never know with Campagnolo.
I ordered this from Condor as I need the hidden bolt for my Athena 11speed cranks. The parcel will arrive tomorrow, I can measure the washer with my digital vernier and give you its dimensions? I presume the washer is of equal dimensions as between Athena and Centaur as the product description on the Condor page states that it is a "Genuine set of 5 chainring bolts for 5-arm Campagnolo chainsets with a hidden bolt."
I have also bought Campag spares from https://thecycleclinic.co.uk/ in the past, they might help. This page looks useful: https://thecycleclinic.co.uk/collections/bolts-and-screws. And maybe this is the part you need - https://thecycleclinic.co.uk/collections/bolts-and-screws/products/campagnolo-10-speed-chainring-spacer-fc-re006 ?