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YW!
Hard to find, though. There’s a silver XCD pair in NJ USA for about £80, likely there’ll be import tax too. The older style, more elegant XC ones seem to go for a lot. Presumably the caliper was thickened to reduce flex. I lucked out when I needed a pair, found a UK seller, NOS XCD pair for £50. They are out there. And they’re great, riding a tandem with just these for stopping, even with luggage have been great. I love them! Even been thinking about building an entirely new bike with them. Which would be totally stupid.
Two months late ... Try a pair of Suntour Roller Cam? I have 559x50 tyres on my tandem, the brakes can clear the mudguard if you set the cam height just right. Tyres need to be deflated to remove wheel though.