DONT DO IT DUDE!!! i sell HID kits, LED lights, and retrofit on the side, and all other car work. those LED's will burn out on you fast. before i started selling locally, i bought those for my lights and as a signal, it will blink fast as if a regular halogen bulb will burn out. to fix the fast blinking part, you will need a relay for that. but that LED bulb sucks biggums. i recommend the LED lights that are NOT miniture bulbs, but get the ones that have little microchips. those are the brightest ive played with so far and last long and sale well.
i recommend something like this.
and honestly, i like it blinking fast so people are sure to see me signal multiple times before switching lanes real quick.
and i dont even use the one in the link above. i have a custom made LED bulb that is pretty close to the brightness of a strobe light. it took me about 4 hours to make and costed roughly 47 dollars. i got a ticket for it being so bright, and it flashed fast. he assumed it was a strobe light, but i fought it off by arguing that it was the color amber. i made a custom white signal for my friend's lexus is250, and his is almost brighter than an HID kit at 5000k. he too got a ticket, and it blinds us all when he signals at night. but i dont recommend that. were just kids over here that have time on our hands to mess around. :-D