8" subs

I’m removing the factory sub and amp behind the seat of my F250 and was going to install my two 12” subs I already have from another truck but while calling around for a behind seat enclosure I’ve had several people say that I would better sound and bass for a behind the seat setup running 4 8”...

I've been trying to search on the site for options, but the search function keeps giving me an error for some reason. I'm looking for option(s) on a subwoofer that can work under the backseat of my truck. I'm more of an SQL guy, but I'm only going to be giving the sub The height is an issue...