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Thanks for the wealth of information. Just rang Spacycles and they say the extra boot in this set https://www.spacycles.co.uk/products.php?plid=m2b0s173p482 does the job. If the spacer doesn't work I can fashion something
Jw89
Those are 11sp chainrings? If so, made for Ultra-/Powertorque cranks with a differential BCD. You can enlargen the 5th hole with a file until it fits. The FC-RE102 bolt is proprietary, The FC-RE105 spacer is 3.7mm thick. You'll also need a washer between crank and and outer chainring, 0.4mm (FC-RE006) was used with campy 10sp Rings, so you'd probably need something a bit thicker. Getting these as spares is rather spendy, you might or might not get lucky on ebay, I've seen them sold as sets.
I personally would just get a complete chainset in good nick...NOS/Mint 10sp Chorus/Record rings can still be found at OK prices if you steer clear of scalpers.