Notes: Please check the interchange part number before purchase. This is the best way to confirm the fitment. Communication is the best way to solve the problem. If you have any problems after purchasing, please contact us in time.We promise we will do our best to serve you. Fitment： 66784 valve spring compressor tool universally fits for removing and Installing valve coil springs for all 3/8 and 7/16 thread engine valve rockers. Available to switch between 3/8 or 7/16 thread stud head by adjusting a c-clip Description： .