hi im new here and got a question about my 03 Ranger Tremor it has a factory Pioneer system in it but i want to put a aftermarket CD player in it. then factory CD player has two plug ins one for the two rear speakers and the other for the two front and the factory enclosed subs. but the weiring harness i bought for the truck only fits the plug in for the two rear speakers. how can i get this CD player to work with all the speakers. the guy at best buy said i may have to cut the other connector at tie those weirs with the harness but i may lose the subs. what should i do, if it can be hooked up by doin that and all i lose is the factory subs thats cool cuz i got after market subs i want to put in.

 

what kind of after market head unit is it? also are they RCA plugs to the factory speakers or just wires?