Not to be rude but I think you are in the wrong club. If I am mistaken a Z3 is a car. This is a Vintage BMW motorcycle Owners club. LOL, I have a BMW 335i convertible as well so I am NOT a BMW car versus bike snob, I just think you would get better answers to your question in the BMW US car club. St.
Owner of a 84, R80RT and 78, R100RS