Since this is an older XviD release, the timing is specific to the frame rate and cuts of that particular "DiAMOND" encode. You can typically find these files on: subtitle Idiocracy.LIMITED.DVDRip.XviD-DiAMOND
Search specifically for the "DiAMOND" tag to ensure the .srt file matches your video's timing. Since this is an older XviD release, the
Look for entries that mention "DVDRip" or "XviD" in the description, as these are most likely to be compatible with your version. subtitle Idiocracy.LIMITED.DVDRip.XviD-DiAMOND
Another reliable database for older scene releases where you can filter by specific release groups.