1998 Pontiac Sunfire OE Wiring Harnesses & Stereo Adapters Pontiac Sunfire 1998, Aftermarket Radio Wiring Harness by Metra®, with OEM Plug. For aftermarket stereo. Metra preassembled wiring harnesses can make your car stereo installation seamless, or at least a lot simpler. 1998 Pontiac Sunfire Hitch Wiring | Harnesses, Adapters Pontiac Sunfire 1998, Professional™ Inline to Trailer Wiring Harness Connector by ACDelco®. Designed utilizing the latest technology, this product by ACDelco features premium quality and will perform better than advertised.