E3 = 1968-1977 2500, 2800, Bavaria, 3.0
E6 = 1973-1975 1600, 1800, 2000
E9 = 1965-1975 2500cs, 2800cs, 3.0cs
E12 = 1979-1981 5-series
E21 = 1977-1983 3-series
E23 = 1978-1988 7-series
E24 = 1978-1988 6-series
E26 = 1982-1988 M1
E28 = 1982-1988 5-series
E30 = 1984-1991 3-series
E31 = 1990-1999 8-series
E32 = 1988-1994 7-series
E34 = 1989-1995 5-series
E36 = 1992-1998 3-series
E38 = 1995-2001 7-series
E39 = 1997-2003 5-series
E46 = 1999-present 3-series
E53 = 2000-present X5
E60 = 2004-present 5-series
E63 = 2004-present 6-series
E65 = 2002-present 7-series
E80 = 2005-present 1-series
E85 = 2003-present Z4
I don't know or care what the E## designations are for the X3 and Z3. ///M-Spec likely knows them.