10 and 12mm long are the standard screw sizes and you arent likely to find anything off the shelf between it.
Seems like a weird spec, +/-0.5mm is a pretty typical screw length tolerance so the standard 12mmL screw would be within the range I would expect, maybe give that a try.
I feel like this can be generalized to AI in general for most people. I still don’t see much usefulness or quality in output in the scenarios where I’ve been exposed to AI LLMs.