1967 Mustang Wiring Harness | eBay Part # 20121. Painless Wiring. This 22 circuit direct fit 1967-1968 Mustang harness has many of the factory connectors already installed on the harness out of the box. 1967 mustang wiring harness | eBay www›Search›1967 mustang wiring harnessFind great deals on eBay for 1967 mustang wiring harness. Shop with confidence. Skip to main content. eBay Logo: 1967 1968 FORD MUSTANG ENGINE WIRING HARNESS SMALL BLOCK W/ TACH # 67-22713 NEW. Brand New. $18. Buy It Now +$10 shipping. Wiring Harness Strap Set 1965-1967 Mustang. Brand New.