tr6 wiper arms

I have a stock 1974 TR6.  I have removed the wiper arms.  One is basically
straight and the other has a bend in it.  Which one goes on which side?

On another note, my dash lights went dim a couple months ago.  They used
to be fairly bright but now I can barely see them and I don't think it is my
eyes?  Any ideas on what to look for to fix it.  I would like to be able
to read the numbers on my dash at night.

TIA
Doug Barneck