I posted this a couple of days ago and didn't quite get the response I was looking for:

"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."

I'll try a different approach

Can someone with a W123 wagon please read off the part number from both tail light lenses?

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