I think I have a CB250RS disc lying about somewhere if it's any use to you? Yours for postage and a pint.
Many thanks for the offer Ian, however I also have an RS250 disc but I’m “upgrading” the front brake on the “different tracker” project bike. I’ve since found out that, yes the CX Eurosport front disc is a direct swap for the smaller original RS disc.
The CX disc being a larger diameter. So going for an EBC stainless replacement, along with a Royal Enfield scram master cylinder/lever and front caliper.
All that braking power….. I’ll be pulling stoppies at every set of traffic lights I come to 😁😉