Custom fit 10" layered MDF Sub Subwoofer Box underseat VW Transporter T5 T6 | eBay
Amazon.com: Sound Storm Laboratories PB8 Car Subwoofer and Amp Package – Built-in Amplifier, 8 Inch Subwoofer with Passive Radiator, Remote Subwoofer Control : Everything Else
Subwoofer enclosure Bass Loudspeaker MDF Woofer Box for VW Transporter T5 R | eBay