Those magazine ads make me feel like a child looking at the Sears Christmas catalog. Modern RWL radial tires (TA Radial - the Cooper Cobra)are nice but simply not available in the same sizes as the N and L old school rating. A 275 60 15 is almost an L 60 15. But there is no equal to the N 50 15. A metric equal would be a 325 50 15 which is available in a modern soft compound black wall tire but not in a long wearing RWL configuration.