You won't get very much midbass out of your component set in the kick panel.
The motor on that component set has a smaller diameter than the cutout, which is probably within .5" of the factory cutout. With MDF spacers(you can buy them from people here for $5-10 shipped for a pair, maybe even less if you catch someone having a good day), they'll fit for sure. You'll be muuuuuuuuuuuuch happier with their performance than with a pair of coaxials and an extra set of components in a less than optimal setup.
I'm sorry if I'm sounding pushy; I'm just trying to give you advice that will serve you well. As long as you understand that doing what you want to do will cost you more money, more time, more effort, less SQ, and less performance, I'm fine with whatever you want to do. It's your vehicle, so do what you want.