90 chrysler TC, speakers

to the best of my knowledge this car is a glorified lebaron-- any how it has 8 speakers in car with amps built on to the speakers--I need to replace the speakers with aftermarket-- how do I go about doing so? I have already replaced the stock head unit with aftermarket and that went smoothly

thanks

any one have any info?

I think this is actually a chysler infiniti system

do I have to run new speaker wires?

or can i just use 2 of the 4 wires going to the stock speakers and cap off the

2 power wires?

thanks

Josh