Threads like this confuse me. Granted, my Windsor is not exactly the same, but close enough. I just tried two racks from my spares box. One was a tubular rack from a mountain bike, with sturdy round struts. Clearance was close, but a little bending would fix that. And since the brake moves away from the strut when you use it, contact should not be an issue. Then I tried a rack with the flat straps for struts. Plenty of clearance, no bending required.

Alberto, judging by the bikes you own, I'm guessing you have at least the very minimal mechanical aptitude required to work on your own bikes. If you are buying a rack from a local shop, you should be able to check fit before leaving the shop. If you have an existing rack, or are buying one online, you should be able to make it fit.