and where do u buy them if its possible

I just saw these today.. I want to say I saw them on ema-usa.com but check our sponsors on the left.. they actually just plug right into the existing socket. Though I hear if you switch to leds you can't use the integrators... dunno if this is true though.

I have a Libertek DIamond Headlite kit FS. It replaces your tailight aseembly and retrofits into the two remaining holes. Its has a real nice effect, where the inner lights flash red on brake, and the outer section will flash yellow on signals. They are black and look real trick on an undertail. LMK if you're interested.

-whoRR

Discount / Advance Auto, sells a LED tail / brake bulb that fits right into your existing socket. I forget the bulb number, but it is on the fast and furious section and you just need to take your existing buld in to match up the part that pligs into the socket.