subs under the seats continued........

[WRMZ71]

I just redid the floor in my cab and am hopefully getting some sound deadening Vblock padding in there. Right now I wanna upgrade my sound system too. I work on motors and not stereos so bear with me on this one. I was looking in this post here http://67-72chevytrucks.com/vboard/s...&highlight=amp cause i remember the 724X getting his stuff cheap at walmart. I don't think he ever gave the box dimensions though. All i want is probably one 8 to go under the seat and i'm sure an amp to push it. Does anybody know the dimensions to the boxes he used in that forum and did they work?