I need help determining the size for bilstein shocks locknut
 

I was driving home from work ran over a pretty big speed bump all of a sudden I hear a *POP!!!*. I pull over look under the hood and noticed from the front strut popped out from under the good. The bushings and the nut got lost in the incident https://i.ibb.co/Zzyr5rd/20200716-203438.jpg


These are Bilstein shocks. Does anyone know the locknut size that goes on top?


Thanks

Both nuts that lock against one another are 17mm on Bilsteins.