I just bought my brother some aftermarket speakers for his car and was wondering if I need to get speaker harnesses or anything to put them in. he has an olds cutlass supreme and these speakers won't be hooked to an amplifier. Will the wires connect directly to the speakers (infinity speakers). Thanks for your help!

The wires won't plug in directly to your new speakers. You have to put new connectors on the existing wires that are in the car. Your speakers should come with wires with plugs already on them. All you have to do is plug those connectors into the speaker, cut the other end and connect them to the wires in the car by either soldering or using butt connectors/crimp caps.