A little piece of mind with these Wehrs jam nuts. Steel design instead of a hex nut. They come in 1'' coarse, uses 1-1/8 wrench.
 
Now the Wehrs 3'' tall screw jack jam nuts. Designed with the hex moved up on the front screw jacks to clear the upper control arms. No more fighting to get a wrench between the control arm, screw jack, and shock.
 
Sort jam nuts come in sets of 4.   WM 4910S
Tall jam nuts come in sets of 2.     WM 4910ST