Riley 2½-litre RMB saloon The RM series were the last cars developed by Riley, later cars were badge engineered upmarket BMC saloons. The 1st was the 1945 1500cc RMA and 2500cc RMB replaced in 1952 by the 1500cc RME and 2500cc RMF, the new model got a larger back window and full front bumper. In 1954 the running boards were deleted. The larger engined RMB and RMF got longer bonnets. In 1948 the RMC convertible was introduced, replaced in 1949 by the RMD, more of a drophead coupe convertible, also the RMC had scolloped doors.