Is the only differance between Radarlock XLs and Radarlocks (other than the lens, obviously...) the nose piece? Seems like the "top" part of the frame is the same and they just use an extended nose piece. And are these longer pieces avaliable anywhere? Oh and message to Oakley, please make more XLs, they're great! Got a pair recently (after seeing Niki Terpstra win Paris Roubaix in a pair of Radar XLs...) and I've worn nothing else since!