Not sure when they became available, but those of you with a silver Z3 "///M coupe" can get the (1/18th I think?) scale model of your car at your BMW parts counter.

The part number is: 80 43 0 020 856

Note: The above model is silver (pretty sure it's Titanium and not Artic) with all black interior. It is also the European version, with the Euro motor and Euro back-end treatment.

I was given a black with Imola Red (US) model when I purchased my Titanium Silver with black Coupe in May'99, as the silver model was not available at that time. Well, I took my black one back that was still in showroom condition (with original box and all!) and my dealer traded me straight across for the silver. Nice, huh? Sure looks good sitting on my desk at my office! FYI