1990 300SEL (W126)

Tomorrow I'm off to the salvage yards in search of bumpers. I'll be taking a truck and not the 1990 300SEL that I need the bumpers for.

Does anyone know FOR SURE the full list of years and models that will have bumpers that will fit? I'm sure they all look similar, but I'm sure I can't return them once I buy them.

Thank you in advance.
D.