I'd get an
axiom streamliner road since it's designed to mount to the brake bolt. If you wanted to strip the powdercoating/paint, it would polish up beautifully since it's aluminum. Another option is the
blackburn ex-1 it's stainless so more expensive but you'd need p-clamps to mount it or you could fabricate a custom mount from some flatbar so you can mount it to the brake bolt. Many of the cheaper no-name racks have three sets of holes so you can mount them to the brake bolt. I think that's the cleanest way to mount them on a vintage from, unless you really plan on loading the rack up.