; BMW Z3 (E36/7 & E36/8) * Original radio options - InCarTec

There are multiple original radio options in the BMW Z3 (E36/7 & E36/8) *, which option is the original fitted system?

Enclosed Subwoofers/ Drivers Enclosed Subwoofers/ Drivers
Extra Slim Subwoofers Extra Slim Subwoofers
Spare Wheel Subwoofers Spare Wheel Subwoofers
Underseat Subwoofers Underseat Subwoofers