For the specific 720p.BluRay.x264-[YTS] file, you can typically find the matching subtitle on these major platforms:
: Look for entries labeled "YIFY" or "YTS," as these are timed specifically for that encode. subtitle Marathon.Man.1976.720p.BluRay.x264-[YT...
: A site dedicated specifically to providing subtitles for YTS releases. For the specific 720p
: Often has the most reliable "proper" versions uploaded by the community. For the specific 720p.BluRay.x264-[YTS] file
If you tell me which you need, I can help you find a specific direct link.