JBA p/n 6611S headers are designed to fit ‘64-1/2 - ‘70 289/302 (not Boss) Mustangs equipped with late-model T-5 5 speed transmissions. These headers provide significant increases in torque and horsepower throughout the RPM range and allow for maximum ground clearance. To help make sure you choose the correct headers, h-pipe and exhaust for your Mustang please refer to the chart below. If you still have questions, give us a call. Stainless steel finish