1965-1973 Mustang Restoration Under Dash Wire Harness Shop Under Dash Wire Harness for your classic 1965-1973 Mustang at NPDLink! Free shipping over $300, fast delivery & everyday low pricing! 1965 Mustang Parts - Mustang Wiring Harnesses Mustang Wiring Harnesses - Electrical Wiring Harness - Dallas Mustang - Order Mustang Parts Online!, The Mustang was changed a bit in Aug 1965 and the Mustang Fastback was introduced. The 1965 Mustang GT was made available. There are more differences between early and late 65 Mustangs than ’66 Mustangs.