The 26" forks will need some modifications to work on a 20" frame...couple more inches of threads cut and a spacer between the top race and collar. PM me if you need threads cut. I'll dig out my tiller bars and take a picture next to a set of butterfly bars....but I think they're considerably shorter, and trust me, an original set is not economically feasible compared to a set of butterfly(stingray) bars...not to mention, I cringe at the thought of bending steel tube from the 30s, for structural reasons and rarity's sake. There is somebody popping the tiller bars out now at a cheaper price without chrome. May be able to track that guy down and get him to modify you a new set..? I don't know who it is, but probably the same person making the airflow bars.