whats the best way?

How would you guys install a set of tens in a regular cab 89 gmc sierra. I got a truck box but when i put it in the truck to test fit it and it makes things a little uncomfortable im 6'3 and need the seat all the way back. Any suggestions? Thanks in advance.

center console or kick panels

fiberglass

you can make MDF sides and fiberglass the back side to gain space

i took out the center console and put in a fiberglass box in my 04 extcab silverado 2 12's