Installing 10" subs in extended cab

I would sell the subs or return them and then buy a pair that will fit. I have a little rule I like to follow whenever I do an install. Buy gear that fits the vehicle and don't make the vehicle fit the gear.

If you absolutely have to have these subs your options are to either lower the floor of the truck or raise the rear seat higher.

Thanks for the reply, I've came to the conclusion to get new subs. Also a good rule to live by!

I had a 12 under the seat in my 2000 sierra. But i made my own box.