"It's a standard w201, 124, 126 third brake light with a w126 mounting tower that I modified by trimming it shorter."

the 201 and 124 used the same light, different base. the 126 light was larger and had a different angle to the lens side, and a different base. since you said the gasket makes contact all around, need to know what the part number is (can't read it int he picture) so I can know which kind to use for my own project

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