The Campy SR pulleys that I have are nothing special, bronze bushed, I think; if you're hung up on authenticity, then you gotta have 'em. I have some Suntour ones that have sealed bearings, and they spin more smoothly. They show up on eBay frequently. I'd like to find a set of the old type with loose ball bearings. Had those on a Huret derailer a long time ago, and I thought they were cool.