Does anyone know if i can fit two of these in a 2004 F150 Supercrew?

 

Depends what your definition of 'fit' is. If you still want a usable back seat, then no.
Where do you want to put them?

 

yes i still want a usable back seet. Whats the biggest i can fit back there?

 

Pair of tens probably. Im not to sure about what fits and what doesnt fit in the screws, I think they MIGHT make boxes for 2 12's, but no way in heck would 2 15's fit under there.

Do some searching.

 

The only way you're gonna get 15's back there is to put in captains chairs in the back and then do some seriously creative box design. The other option is to put the subs in the bed and do a cut through into the cab. I've seen that done, but again that's a major modification. 2 12's is possible, I think. 2 10's for sure.