The 10085 comes with (2) #6-32 mounting screws that protrude .16" when fully tightened. You would need to make sure that there are some bushings lined up and installed where the lampholder is being mounted. The screws can be tightened/loosened from inside the socket. Alternatively, the 10085-5 is the same lampholder with bushing mounts assembled to the body that are tapped at #6-32. The 10085 comes with a washer, not the 10085-5. All of our screws are combination-type. Feel free to call us directly at 800.824.3005 if you need further assistance.