I have an 88 targa that im putting a sub into. Its a 12" infinity kappa perfect. the problem is that i need to figure out a way to fit it in the back of the car and still be able to take the top off and store it in the back of the car. i dont want to remove my spare tire if i dont need to. i need about 10" of mounting depth for it. If anyone has any good ideas let me know.