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Consider also Lotus for a replacement mirror, since I believe they are identical.
The mirror part is the same but the base is different. It is cut out on the bottom because the door is different. Also the Lotus base is solid and the tesla base is hollow. It can be made to work with a little grinding. I have a few if you run into a hard time finding one.
Sorry to hear about the mishap. Sometimes you can stop someone merging onto to just with the horn. I drive in the DC area and people are sometimes quite distracted. On more than one occasion I have woken someone back up into reality with my horn when they were about to merge onto me.
So glad the only damage was to the mirror...
The Elise/Exige mirror bases from the S2 appear to me to be exactly the same to me as well as the identical curvature and hollow base. I'm 100% confident they'll work on the Roadster and there's no difference at all between them. I wouldn't even doubt if the part# is identical (if stamped).