My Haynes repair manual has a pretty good set of pictures of the different 4 and 6-cyl versions as well as the SOHC and DOHC versions. Also shows diesel versions. Black and white shots though.
2009 ML350 (84K) - Family vehicle
2001 CLK430 Cabriolet (71K) - Wife's car
2005 BMW 645CI (124K) - My daily driver
2012 Mustang V6 (60K) - Daughter's car