Smart Roadster (03-05) Hertz Speaker Boxes 130 mm Front Doors with Premium Insulation STP Black Silver Shop Pack (8 Panels each 375 x 265 x 1.8 mm) : Amazon.de: Electronics & Photo
Smart roadster entertainment upgrades : r/SmartCar
JL Audio Motorcycle Speaker Pods Custom-fit speakers for 2007-up Can-Am Spyder RS Roadster (Model SB-CAN-PODS1-M770) at Crutchfield
BMW Z3 Roadster Subwoofer Sub Woofer Speaker Rear Center Console Philips 96-02 | eBay
Pioneer
Easy Speakers Upgrade -- drop in and no existing modifications required | MaverickTruckClub - 2022+ Ford Maverick Pickup Forum, News, Owners, Discussions
Ssv Works Br-b65u Unloaded 6.5" Rear Speaker-pod Add Ons : Target