Nissan 370z Spare Tire Well Speaker Box Sub Subwoofer Enclosure – AK Audio
ESX VS1100P Spare Wheel Subwoofer for Reserverad-Mulde And Rims ( Since 15 Inch) | eBay
Sub woofers in the spare wheel well. - Team-BHP
Custom Fit subwoofer enclosure for 17" spare wheel (max. install-depth 120mm) | eBay
For those of you who want more bass but don't want to sacrifice your spare tire or hatch space, I highly recommend this spare tire mount subwoofer : r/GolfGTI
Spare Stepney tyre subwoofer enclosure for all cars - YouTube