The bumpers you are looking for have multiple issues with that solution.

pre 74 are 1 serie and the grill and bumpers are slightly different to fit the shape I believe
74-76 are 2 serie (facelift) and I bleive the grill is lower and slightly wider.

I could be wrong

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MAKDUFF3

1975 300D, Feuerrot and Parchment interior

1971 220D (RIP)