No no no... you are missing something, the total width of the bush and the mounting position. Oem and powerflex bushes are both 60mm in width so if you want to turn the bush down to fit in the ring you must also grind the sides of the ring about 3mm to fit the bush correctly into the mounting position. To fit mine i took measurements from old bush, took the ring out, made two new rings and weld them in the axle and now is perfect. Here are some photos to show you: