On M116 engine the spring bracket would be 1160700740. Try to find photos of that. Those allen heads get easily damaged. One way to get them out is to hammer star shaped male socket into the elongated hole. That is if there is room to do that. M6 is the size if I recall correctly. Other way is to try drill the screw hollow. I have red here that impact wrench and valve grinding paste at the tip of the socket opens them without stripping.