As most know, changing the drivers side can be a challenge. I purchased one of the Harbor Freight dog bone wrenches which didn't help removing the OEM shocks since the top nut was 21mm. It did work great for installing the new shocks since the top nut is 3/4". Kevin
Agree the 13/16" should fit a 21mm, however for these nuts a 6 pt 13/16" socket would not go on. A 12 pt 13/16" will go on but not a 6 pt. socket.