Indicator lights can have a short life expectancy in tough city traffic, especially when built into the back mirrors, or when you have a fall, however mild. So it's always good to have a place where you can get them quickly and immediately...like for example at Motocard. Here you can check their availability: if they're in stock you'll receive them quickly, if not, they'll arrive directly from the supplier, just waiting for the minimum order so as to bring them to you.
Change the left or right or both back mirrors and don't forget the adaptors. If what you want is better aerodynamics or simply a more aggressive look, we also have indicator lights built into the fairing. In summary, we have all types for good signalling, as on the road it's as important to see as it is to be seen.