1998 BMW Z3 M Roadster E36 #1029 OEM Harman Kardon Subwoofer 65138400106 | PK Auto Parts Inc.
Subwoofer fix | BMW Z1 Z4 Z8 Z3 Forum and Technical Database - ZRoadster.org
BMW Z3 Roadster Harman/Kardon HK Rear Subwoofer Speaker w Enclosure 2000-2002 OE - 6853 - Prussian Motors
BMW Z3 10" subwoofer install | Car Audio Forum | CarAudio.com
Factory Auto Sound / FAS Group - Custom subwoofer enclosure for a BMW Z3 Roadster. 8" Hertz Energy woofer. 6.5" Hertz Energy components and a 5 Channel Hertz amplifier as the power