One new PTZ brand mechanical fuel pump (made in Slovenia), part number FP14223, 13.31.1.252.506, 15.11.1.2000, 118.111.2000.3.  This fits:

BMW 1500 1959 - 01/1965
BMW 1600 1959 - 04/1964
BMW 1600/2 03/1966 - 07/1973
BMW 1800 1963 - 07/1972
BMW 1800/2 09/1970 - 07/1973