Yes, the top of the fiberglass circular tub/box is about 14.75" inside diameter, the MDF top circle is 20". You could run either one. Check the cubic inches recommended for the enclosure, every inch of 15" diameter is 176 cubic inches. (There's 1728 cubic inches in a cubic foot.) 15" is the largest diameter that fits down in the spare on top of the hold-down nut of the tire, you could go smaller diameter if you need to. If you needed more cubes you could go another inch or so higher without crowding your trunk. Remember to subtract the volume of the subwoofer itself.
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