You'll have to build an enclosure for them to work. It can be done though. I used fiberglass and made an enclosure using the factory Bose speaker as a template, mounted powerbass L series 8" subs in my doors. They're only 3.5" deep, so they just fit behind the door panel and I can still roll my windows all the way down.
These 3-way set-ups from Morel will fit our front doors/dash corner. 3.5" mid in dash corner, 8.75"(only 2-13/16" deep) or 6.5" woofer and tweeter in door. Bi-amp capable crossovers! I have the 6.5" 3-way and they sound amazing!