Cut the connector and connect the wires that you get with the speakers to the existing wires. Any off the shelf will work and will be an upgrade from stock. But if you just wanna listen to the radio then doesn't really matter.

__________________
1997 B2300 reg cab 2.3 Lima, 15x8.5 Mickey Thompson classic 2, 31x10.50 cooper discover at3, 7.5 open 4.10 rear, dynomax super turbo catback, alpine iva-w200 w/ nav, kicker 6x8s, alpine type R 8, alpine 250W mono amp, power bass 400.4, tool box & camper shell, compustar alarm/remote start.
1956 Ford F100 rust bucket with big plans!