I searched on here for a while about the size of my shifter's threads, and couldnt find any thing for the g-56, but after a little thought and a bolt from home depot the g-56 and the nv5600 have the same size shifter **** threads.

Edit: 10mm with a 1.5mm pitch

 

yep. m10x1.5 on the top end, and m14x2.0 on the bottom [where the stock mounts to the shifter on the transmission] same for the g56, nv4500 and nv5600