On the Sylvania site they list the rear sidemarkers as taking a wedge type bulb just like the front. Last I checked my rear sides didn't light up. Is this something that is on the Ist? It might be cool to use rear side clears with red leds, otherwise I am going to smoke my rears. :?:

 

they probably thought it was the same as teh xB. thats my guess, I don't know what the xB uses