They are the same spec as Euro cars, I know, I live here and drive one myself

Dump the radio and you are all set. Below is my data, actually for some reason it is designated as CN22 on my registration document.
If you can see the auction data, go for 4 ~ 5. Mine was 4 and it was as close to perfect as a 13 year old could have been (13 when I bought it).
My opinion natch..... Oh, and it has fog lamps and not a blemish underneath, as far as I know exactly the same as Euro cars.
Data for vehicle identification number: WBACN12090LL74xxx
Model description Z3 2.2
Market
Europa
Type CN12
E-Code E36 (7)
Chassis Roadster
Steering rechts
Doors 2
Engine M54 - 2,20l (125kW)
Drive Heckantrieb
Transmission automatisch
Body color Topasblau Metallic (364)
Upholstery Leder Cameleon/topasblau (V3PB)
Production date 24.01.2002
Assembled in Spartanburg
L807A Länderausführung
Japan NATIONAL VERSION JAPAN
