I bought a 2005 F250 CC w/ a short bed. Already had the cap on it (I want to take it off and get a Bakflip once I get some money). It is wired for the brake light and interior bed light, but the fuse was blown and the bulb had a hole in it when I got it.

So I'm looking for the information (volts, watts) for the lightbulb that sits on the inside of the cap right behind/below the exterior brake light.

Anyone know what kind of bulb that is?