Hard to tell really. Different batch numbers can result is more then just different circuit parts but hardware parts as well.. If it was my camera I would remove the damaged one using an easy out or if you have a micro cutting tool put a flat head slot in it and remove that broken part, My guess as with most of my quality bullet cameras they have pointed tips so even the replacement would need to be shaped at the tip.. After removing the piece I would take the one from the base and see if it was a fit, If it is I would take that to the Auto Parts store to find a replacement. My local hardware store has bolts and things but they don't have any that would work for my cameras seeing the type of bolts they are.. Test it with a Magnet and see if it sticks. If it don't replace with like kind to keep it from rusting.. Even my 8lbs bullet has a pointed set screw at that location..