Wondering if anyone else can help enlighten me with this dilemma.

EPC says that headrests are specific to the chassis and that there's very little interchange.
However, they appear to all be interchangeable between chassis and models where the EPC says they shouldn't.

For example, front W123 headrests are supposedly different from wagon headrests, but they fit just fine. Perhaps they're a little wider?
Also W123 and W126 headrests appear the exact same, with the exception of W126 leather headrests which are smaller.

I don't have any W124s or R107s around to test on, but I'm wondering if those may also be the same.

I'm referring to 1980 and later style, but I'm wondering if it's the same for 1979 and earlier, with W116, W115, W114

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