1988 Fox Body Mustang Wiring | CJ Pony Parts But improvements in technology allow everyone — from a novice with a repair manual to the most advanced tuning specialist — to extract even more performance from their Mustang. At CJ Pony Parts, our team is ready to help you. Browse the 1988 Mustang wiring options available in our online store, or give us a call today! 1988 Ford Mustang OE Wiring Harnesses & Stereo Adapters Ford Mustang 1988, 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.