Thanks blue!
EDIT: Actually, is there a way of finding out if the car has it fitted already? I don't know how much truth there is to what I read, but the m030 was supposedly part of a sport package of some sort on the early models, maybe MY97 specifically, which included the 17 inch wheels. While I really don't see many Boxsters with 16s, it just got me wondering if those bits might already be there, and if there's a way to find out aside from someone who knows what they're looking for taking a look under the car?