Glad my thread was helpful in your sub research. That RF enclosure does look like it would be perfect. Shame you can't find it for sale anywhere. Since your sans spare, and it looks like none of the premade boxes are designed to fit a vert, I really think your best solution is to find a box designed to fit in the spare tire well.
I just bought a speaker box from zenclosure.com
Looks like you got a typo in there. Here's the correct URL: http://www.zenclosures.com
2012 Kona Blue V6 Premium MCA, stone interior, AT, electronics package, rear camera, reverse sensing & security, HID, 3.31
Ordered: 4/11/2011 | VIN: 5/26 | Window sticker: 6/7 | Build date: 6/13 | ETA: 1st-6/24 2nd-6/29 | Arrived at dealer: 6/24 | Took delivery: 6/27
Mods: BAMA 87P Tune, Airaid CAI, Magnaflow Street Axle-backs, GT500 Diffuser, Shelby Kicker Sub, Painted Mirror Covers, Adjustable Headrests