I have a W126 magazine from performance products. They want, for a brand new(not rebuilt) cylinder head $1749. The cylinder heads ARE the same between the OM603.97x and the OM603.96x.

Cars that have that head

1987 300D Turbo

1986/87 300SDL Turbo

1990/91 350SDL/SD Turbo

1992 -95 300SD/S350 turbodiesel