These bumpers came with a 74 450SL I bought. anyone know what they belong with?

The first three pics. look like non US 107 rear bumper chrome parts. The last two pics I don't know. I don't think they are 107 parts. Here is a link with pics. of replica 107 bumpers. https://www.benzworld.org/forums/r-c...-interest.html

Thanks for the comment. I was hoping that was a rear euro bumper.

I think the other ones may be for an old 4 door Mercedes. Looks kind of like the upper bumper on some of those cars that had what I call a double bumper around the corners.

Any other thoughts?

Appears that the last two pics are from a '73-'80 W116 sedan

I'm now being told that the top pics are not of an R107 rear euro bumper. Now being told it is a W123 rear bumper? Any way to tell for sure?

Any place to cross reference part numbers? Appears to be a genuine Mercedes part. 116 880 0271 is stamped in the chrome, underneath side of the bumper, right in the center.

Correct. A 107 has a part number beginning 107.
Since the Mercedes EPC changed I now use this version https://mercedes.7zap.com/en/eu/fg/car/ for part numbers.
If you google Mercedes EPC you will find others. Like this: https://nemigaparts.com/cat_spares/epc/mercedes/