Someone on the forum graciously gave me a 123 TD tail light. I'm looking to match it but I don't remember if I have a left or right. Seems like it could fit either side.

The part number of the lens I have is 123 820 20 64. Is this a left or right lens and what's the part number of it's mate? It's embossed on the outside of the lens as well as on the gray plastic housing.

Thanks,
Sixto
91 300SE
87 300SDL
83 300SD