1989 Lincoln Mark VII OE Wiring Harnesses & Stereo Lincoln Mark VII 1989, 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. 1989 Lincoln Mark VII Hitch Wiring | Harnesses, Adapters Lincoln Mark VII 1989, 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.