I have a 97 firebird and i have 2 12in subwoofers and i dont kno wat kind of box i should get 2 make iti fit?

wat kind of box should i get that will hold both subs and still fit in my firebird hatch.......my box right now is a big dual sub box and doesnt fit..i could cut it and make it work but i dont want to cut it..should i get 1 of those 6inches thick and not very wide or wat......