Not a tuning part as such but i'd have thought i could have bought some tinted indicators from somewere, a few years ago you could not move for the things for most vehicles.
I've fitted carbon bullets to my cup so now i have a white light in the middle of my door strip, a tinted lens here would solve that.
These same units seem to be fitted to a few renaults so i'd have thought there would be a market for them.