300SDL/OM603 Lower hose on right, upper hose on left.
560SEL/M117 Both hoses on right side.
300SE/M103 Both hoses on left side. (same as M104)

Different radiators

__________________

Present
1987 300SDL
1991 300SL
1990 560SEL
2001 ML320

Past
1969 200D 1979-82
1983 300SD 1984-85
1972 250C 1982-02
1995 S350 2011
1997 S320 2012