The diameter of the stud on the 2" is considerably larger than the 1". The 2" is just under 1" diameter. I didn't measure the 1". Allstar Performance makes many parts for the dirt track and roundy round world. While I doubt they are tested to meet OEM production car use, I'm willing to take the risk and use them. I'd imagine the life of a ball joint in a circle track car is tougher than my street car that may only see 3000 miles a year.
