Well...
I have a 96 regular cab with Prelude bucket seats. I was able to fit 3 10's, 3 amps, and a capacitor, but it required alot of work. Anyone taller than myself really cannot drive it, and i'm 5'10". I have 3 boston acoustic competitors, with 6" moutning depth, and .5 ft^3 sealed. According to Alpine, your subs have a 5.9" mounting depth. I know it looks deceiving, but make sure you measure really well...unless the buckets are installed very very far back, I think you might be able to fit them. Make sure to take into account the angle at which you like your seat (i only installed the speaker grills because the middle sub is exposed). It might be a tight fit, but it worth it when your done to see the look on people's faces.....best of luck with whatever you decide!