Not sure about the part number but I do have Silverstar H4's.
Some people claim they are no better than any other bulb (from what I have seen, only BMW people, and all due to a single article), other people swear by them (Camaro owners love the hell out of them).
I like them. There are bulbs out there that put out more light, but most cost a lot more.
My advice, try them, do not let some of these people claiming they suck dissuade you. I never heard anything bad about them untill I heard the BMW guys start bashing them.