the older chevy alts can be made to fit almost anything,how much power can you get from the sub amp /hcca.if i remember 1000 watts rms at 1 ohm ,also do you have subs yet or you still need to buy them ? i sell american bass .as far as the box you'll want subs up port up to the drivers side if an extra cab.if you wanna make a bracket for the alt ,i can sell you a 175 amp chevy alt .most of the time it's pretty easy to install the chevy alts .my alt came from my old s10 truck that i wrecked in march ,was my spl truck ,was just rebuilt 2 days before the accident .for $30 i can give you a box cut sheet and plans ,with a material list also for your truck ,would need to know the area dimensions of where the box will be and what tuning you want .i can build one for you but you'd have to drive up and get it ,shipping will be expensive.