I'm trying to attach a rear rack to my bike, but the problem is there are no top eyelets for the stabilizing bars to attach to on the rear fork. I'm probably using the wrong terminology, so here's a pic so you understand my meaning.



What are my options for attaching a rack? There is the single hole where the brakes are mounted, but I've never seen a rack which can attach with a single stabilizing bar. Surely there must be some kind of adapter which can clamp onto the forks and provide thread holes for the rack, but I wouldn't know where to begin searching.

Also if you've got any suggestions for a good rack that can support 25-30 lbs I'd appreciate it.