I have read reviews that said the wrong nut was supplied with this ball joint. I thought it might be a coincidence. NO, THAT IS NOT SO. Reaching for the upper arm to install the nut while lying under the car is NOT the right time! I advise you to check this before installing. I used the nut from the old ball joint, although it's not perfect - it fit the new ball joint. With the right nut it would be 5 stars.