The original ones keep falling out on both TV stands I have from completely different brands, so this is probably a standard size.
The originals look like hot garbage, I'm guessing the injection molds used for these were long overdue for replacement.
DRAFT settings with very low infill should be fine, precision isn't required, most of the print is hidden, and you could always hit the print with a heatgun to make it fit.
The author hasn't provided the model origin yet.