I find myself needing one of these for my 901 tail shift gearbox in my 914.
The picture (modified from one on 914world) shows a side shifter (but shows the correct part of the case casting - the tail cone, complete with the ears that hold the rear mounts), and the red line is where the crack is on mine, which you don't need to know, except to illustrate that I need a new casting.

I'm in Chester.
Thanks.

