link1896
Mr Greenfield
Yep, the workshops up and running.If the shoulder is the same dia as the bolt thread then any allen key headed bolt will do (typically grade 12.9) if the shoulder is larger dia than proprietary is the better option to getting a sleeve made though link might assist.
Can you dig out a drg off the abominable site and check?
Can make custom bolts or spacers for people stuck in a tight spot.