Door Top Guide?

These pic are from the top of my mother's mirrored sliding doors, installed mid 90s. My brother took the pics. They do not appear to roll, they appear to be guides.  One is wholly missing, which is the problem.  Looking over your parts selection, it looks like 23-044 but I do not deal w these everyday, so value experience. There is a patent number. My best read on it is: 375C33?   Question mark is for an indeterminate character.