The stock stud has two flats machine into the ball side of it, get a open end wrench that fits over it and then loosen the nut on the outside of the frame bracket, it should slide up out of the frame bracket when it is loose enough Don't loose the two halves of the nylon bushings that go on the ball of the stud on the bell housing I use a rubber band to hold them on the ball stud,you can probally use some thin wire or a tiny tyrapp also to hold it together while sliding the Z bar onto it don't we love 4 speed cars