Will this box fit into a 99' f150? (supercab)
 

This is the box I want to get but, me being me I wan't to make sure it's 100% the right fit.
http://www.ebay.com/itm/CAR-AUDIO-DU...f79c3f&vxp=mtr

Here's a box in comparison to the one I want that has similar dimensions. You can look at the dimensions for both.

http://www.ebay.com/itm/FORD-F150-EX...item5aeef726c4

I would go with box #2. It is made for your truck and not universal.