Some clown "shortened" the threaded portion of the studs on my K3 frame, making it impossible to mount the grabrail, so I cut the remainder of the studs flush, drilled and tapped them for 10 x 1.25mm, and now use stainless bolts to secure the shocks.
The beneft here is that to mount my shocks I first loosely attach them by the clevis mount on the swingarm, then push them over onto the top mount, fit the grab-rail, then the bolt, a spring washer and a flat washer, tighten it all up and it's done, and much easier than the conventional method! Cheers, Terry.