Sept. 1, 1983 and Newer, May 31, 1987 and Older, W/Leveling Suspension, W/ZF P.S. Pump
w/o Reservoir, ZF Pump w/o Leveling Device, 528e From 09/1983, 533i From 04/1984, 535i To 06/1988, 633CSi From 04/1984, 635CSi From 04/1984