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Subwoofer that fits between seats. | Ford Transit USA Forum
How to Properly Install a Car Audio Subwoofer in a Van | DoItYourself.com
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Amazon.com: Compatible with Toyota Previa Van 1991-1997 OEM Speaker Replacement Harmony Audio Bundle R5 R65 & CXA360.4 Amp : Electronics
Alpine PWE-S8 Subwoofer mounting panel for Ford Transit van – DIYvan
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Car Audio 12" inch Shallow Slim Loaded subwoofer box for camper van car Truck | eBay