American Sound Connection Universal Fit Single 10" Subwoofer Sealed Replacement Spare Tire Custom Sub Box : Electronics - Amazon.com
JBL BassPro Hub | 11" (279mm) Spare tire subwoofer with built-in 200W RMS amplifier with remote control.
Volkswagen VW Golf Fiberglass Box Installation in Spare Tire Well | Explicit Customs
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 Tire Well Speaker Box Sub Subwoofer Enclosure 10" 0.5 cuft of Ai – AK Audio