About 20-years ago one of the Mopar Magazines (maybe Mopar Muscle or Mopar Action) listed the cross reference of the numbers on the torsen bars and the Mopar Perfprmance part number for ordering, but as I recall, The 0.990" bar was the largest bar that had a Left and Right torsen bar. The torsen bars lagrer than that used the same number (on the bar) for both left and right side.