The biggest difference is the 3635 has an original Ford style buckle, with round push button. The 3639 have a square, GM style push button. The OE style 3635 also tend to have a stronger return mechanism for better return function when released.
Asked: Aug 03, 2019 - 06:31 AM PST • Answered: Aug 05, 2019 - 12:01 PM PST • SKU: 6594