Before purchasing, it's best to:
* Verify the engine is exactly the same: Double-check the engine displacement and year. Even within the same engine family, minor changes could affect plug wire compatibility.
* Check the plug wire specifications: Look up the exact specifications of the Mustang plug wires and compare them to the specifications of what your Cougar needs. This will ensure the proper length and boot size. Many auto parts stores let you search by year, make, model, and engine.
* Compare the physical layout: If possible, compare the physical layout of the plug wires on your Cougar's engine to a picture or diagram of the Mustang's engine wiring.
While the odds are in your favor for compatibility, taking these precautions will save you potential hassle and return trips to the auto parts store.
