I have this. It just fits length wise. I mean just fits. It feels bolted in and it's not. Any wider it won't go. I have a few inches in front and 1 or 2 in back. My seat is in. JL Audio CP208LG-W3v3 Dual 8" Subwoofer Enclosure w/ (2) 8W3v3-4 Subwoofers http://amzn.com/B0082DIYBO
Edit noticed no measurements on my link. Here ya go. http://www.jlaudio.com/cp208lg-w3v3-...-systems-93295
If your on a phone like me click full desktop. Heck I'll go try to cut and paste lol Net Weight 32.2 lb / 14.61 kg External Depth (D1) 5.125 in / 130 mm External Height (H) 11.0 in / 279 mm External Width (W) 35.5 in / 902 mm Finally! That's my size.
Was wrong about front to back. Got it against seat in this pic for ya. That's all the clearance I got for this bump thing. The one you want is way to deep. It's narrower than mine which just fits. Having the seat in and tailgate locked mine are the perfect width to not be stolen. So any wider no go.