Yep! I think it is a twist lock. What does 3cp mean?

[/quote] Why not do it the easy way. Take the fixture out, take into auto store, pick up 5w bulb that fits. Or frankly, it might be cheaper to buy from dealer rather than spend hours looking elsewhere.[/quote]

Not the easiest way, but it beats going to my local dealer. I've dealt with a lot of them, but the one i've got now, Cherry Hill (NJ) Mercedes, is the worst of the worst! For instance, you can't use a credit card to order parts over the phone: you have to go there, and come back when the part comes in. Plus, the people in the parts department aren't allowed to process payments. They send it through a pneumatic tube to a cashier in another part of the bldg, and you have to wait there until she gets around to it. Not to mention that they've wanted 50-100% more than other dealers for the same part. So, going to them for even the simplest thing has become the choice of last resort for me.

Thanks for the help