I ended up getting a 60's grill that supposedly came from an unknown year V8 MB ( with round stacked headlights like the pic in post 5 ). It looks like it will work but if there is a wider one I could be interested in finding one. ( The seller seemed to be OK until he started talking about seeing UFOs and mini big foot so I didn't stick around long enough to press him for the exact model. . . )

If you are up to it, posting the dims would help others in the future.