that would be appx.... 6x2x7.75 8x1.5x7.75 5x2.5x7.75
incase u havent noticed there are manyyyyyy ways... besically what u need to know is the port area is 12.56. so as long as you have that port area make it 7.75 inches long and you should have about the same tune... what sub is this. thats a short port.