I'm not sure if this has been gone over before here (more than likely) I just wanted to post this link I found while surfing the enter-web, for those Nitro owners who might want to replace their lights and don't want to have to do the old pull out the bulb and show the guy what it looks like game. I'm not promoting this brand just think the info could be helpful.
http://www.sylvania.com/ConsumerProducts/AutomotiveLighting/LampReplacementGuide/default.htm
Sapper
http://www.sylvania.com/ConsumerProducts/AutomotiveLighting/LampReplacementGuide/default.htm
Sapper