Cheap & Easy Fix
If you just snapped the bolt it can be replaced as it's just a stud. If you can't find the right stud just use a 5mm X 35mm long bolt (.8mm pitch) threading it from the bottom through the half moon.
When i broke one on my SuperT they (OEM Screws) were impossible to find locally & Marzocchi wanted $30 just for one bolt assemble. I'll be damed if i give them any more money to fix there stupid design.