Truck boxes?
 

will truck boxes with 10" subs work behind the seats of my sol? I want to avoid using trunk space.

It depeneds on the size of the box.
a little box will.
a big box won't.
Take the box and put it behind your seat and see if it'll fit.

ill post the dimensions.
Here:
20"(L) x 15.5"(H) x 4.75" (TOP) x 7.25" (BOTTOM)

I wanna know before I purchase them.

Where are you buying them from?
Why not take your car there and ask if you can just test fit them, if it's at a shop that is.