OK, here goes:

124: 1986-1995 model year (in U.S.)
210: 1996 - 2002 model year for sedans; 1998 - 2003 model year for wagons
211: 2003 - present for sedans; 2004 - present for wagons

The SBC electro-magic brakes were introduced with the 211 chassis, so 2003 or 2004 depending on whether you're looking at a sedan or a wagon. SBC continued through the 2006 model year, then was removed for the 2007 model year.

- JimY