Hopefully somebody can check this, because my searching has not been successful and I don't have a G25M-R loose.
I need to know the depth at the base of the shaft where the throwout bearing rides, how deep the shaft spines start, and how far from the bellhousing opening to the tip of the shaft. Spline count and shaft diameters would also be beneficial.
I have no calipers at my house atm, but I'd say it's roughly 11mm(threaded) on the KL mounts, I don't have a tranny sitting in my shop atm to check though.
Edit: If you mean for mounting to the bay, I've no clue.