They are left and right sided, and have an orientation (top/bottom) to assure that the light rings are oriented forward and rearward. Haven't installed or powered them yet, but I'm certain they will be quite noticeable, especially being that far away from the headlight (which we all know is the number 1 issue for indicator blindness on motorcycles as claimed by motorists).
This latter point is actually causing me consideration to relocate my indicators on the 550 despite being LEDs, they're on the headlight ears. Even from 15' away in driveway, they're overrun by the H4 headlight.