A popular community-driven site where you can filter by language. Look for the version uploaded by "GoldenBeard" or other high-rated uploaders, as they often include the 720p/1080p BluRay compatibility in the description.
Rename the subtitle file to match your video file exactly (excluding the extension). subtitle Disturbing.Behavior.1998.720p.BluRay.x...
Since the file name matches a common scene release, you can find the exact .srt or .ass file on these major subtitle databases: A popular community-driven site where you can filter
Example: Disturbing.Behavior.1998.720p.BluRay.x264.mkv and Disturbing.Behavior.1998.720p.BluRay.x264.srt . Place both files in the same folder. subtitle Disturbing.Behavior.1998.720p.BluRay.x...