I am rebuilding my struts, front and rear. I have ordered a 21 mm strut nut socket for the front from ECSTuning; however, they do not offer a 16 mm for the rear, nor can I find it anywhere else. What do people do? Will an offset box wrench work? TIA.

 

Ring spanner

 

As it turns out the rears do not require any special tool, unlike the fronts which due to the deep recess in the mounts requires a socket with cutout for an allen wrench.