didn't twig on to you living in the states though
if you have no luck sourcing the bulb or info needed, next time i'm out at my mates shop i'll quizz him for info as he orders them, so he should have a parts book with info on it.
all i know about bulbs is when it's dusk and i can't see it's a good time to replace it again...other than that i'm in the dark about such issues.