Dimensions:Frame Diameter: 12.5 in. (318 mm)
Mounting Hole Diameter: 10.5 in. (267 mm)
Mounting Depth: 9.5 in. (241 mm)
Overall Depth: 11.25 in. (286 mm)
Magnet Diameter: 7.5 in. (191 mm)
Pole Vent Clearance: 0.75 in. (19 mm)
Displacement: 0.14 cu. ft. (3.03 ltrs)
Enclosure Recommendations:
Sealed Range: 1.25 - 1.625 cu. ft. (35.4 - 46.02 ltrs.)
Recommended Sealed Volume: 1.375 cu. ft. (38.94 ltrs.)
Fc: 44.7 Hz
F3: 40.4 Hz
Qtc: 0.792
Ported Range: 1.5 - 2.25 cu. ft. (42.5 - 63.7 ltrs.)
Recommended Ported Volume: 1.75 cu. ft. (49.56 ltrs)
Recommended Tuning: 32 Hz
Port Type: “Slot” ports are recommended. See Data Sheet for detailed info.
Think you can build a box to the slot-ported specifications on the 12 W7? It would be for a Ford Focus as well, if that makes it any harder

...and how much $$ for the building..and there's two of them as well..almost forgot to add that...heh