PR21W 12V 21W BAW15s Red Philips Stop and Marker Lamp.
This premium bulb is a direct replacement for vehicles with clear lenses, usually stop lamps. Also used for rear end "Fog Lamps."
11.95 each or 20.00 for a pair.
Please note that these bulbs have a unique base and will not fit in the place of an 1156 or regular Euro-P21W. The pins are both indexed and 170 degrees opposite of each other - In other words, this is a BAW15S designated base.