can’t find sub to fit this enclosure

i have an '06 jetta and wanted a stealthbox-type application for my car.  unfortunately, no one makes one.  well, there is a guy who makes some in his garage:
https://www.freewebs.com/uber-stealth/volkswagen.htm

Specs:

Mounting Depth: 4.25+" 
Air Space :  .45 cubic feet
Comes compleate w/ carpet, speaker terminals and speaker wire
Box fits in the driver's side rear storage cubby
Sticks out 3/4" farther than the factory storage cover 
Requires no modification to car to fit 
Grills availible[/i]

So here's my problem:  that .45 cubic feet & power handling.  I plan to push this sub with either my PPI A300.2 or my Orion 275SX.  Both put out north of 300 watts.  i want a single 10" driver that will clear these specs (.45 cubic feet with only a 4.5" mounting depth) BUT will also handle 400 watts RMS.

The sub that this guy offers with it is the ED SQ10, which has gotten very mixed reviews, and can't even handle that power anyway.  i've seen the kicker & fosgate shallow mount subs, but they require double the airspace.

any ideas of what might fit this?
any ideas of what other people/companies might make some sort of stealthbox for an '06 jetta?

thanks!!  :)

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Loving Car Audio since 1992

The Rockford Fosgate P3SD410 is pretty close.....

300 Watts RMS / 600 Watts Peak Power Handling

46oz. Double Stacked Motor Size

Voice Coil Diameter: 2.5" 4-Layer (6.35cm)

Impedance: 4 Ohm x 2

Sensitivity: 83dB

Tuning Frequency (Vented): 46Hz

Mounting Depth: 3.50" (8.89cm)

Rec. Sealed Enclosure: 0.50 cu. ft. (16.42 liters)

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Refined Performance Motorsports