[N*Caddy]

You mean somebody removed the amps off the original BOSE speakers let it in the trunk?
It should work as long as the aftermarkets are 2 ohms impedance (usually is 4 on aftermarket except some Infinity speakers). Even 4 ohms will work but you loose some volume and low frequency response (a lot). Let me put it this way, it ain’t gonna be like BOSE.
Last time I checked on e-bay with less than $50 you can get one complete brand new BOSE speaker, so for less than $100 you can get your sound at its best.