That looks like the older Gen 5 model to me. You would need the older 28-0600 rod for that model. You can buy a new GX PRS set for that motor, but you would need to swap the new rod for the older 28-0600 before you fitted it.
To be honest, I would spend the extra and get a new GX motor. They are far superior in many ways. You gotta go with the new technology