1991 Ford Bronco OE Wiring Harnesses & Stereo Adapters Ford Bronco 1991, 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. Ford Bronco Wiring Harness | Auto Parts Warehouse Let the people with 12+ years of experience in finding and buying car parts help you find the best Wiring Harness for your Ford Bronco. We here at Auto Parts Warehouse want to make sure you're happy with your car part purchases. We know you love your Ford Bronco and want to make sure it's taken care of (maybe he or she even has a name?).