My bathroom shower handle needs replacement — it started falling off recently. It's damaged and needs replacement.
What kind of a handle would work?
Below is how the rest of it looks like. Note that I don't know the brand, it's not written anywhere. Nor do I know which year it was produced.
Edit: here are pictures of the handle itself:
Note that the outer hex bolt is stuck (sitting for hours in WD-40, no success turning it after that). I might be wrong, but I think there are two inner bolts on either side of the inner square piece. One is stuck, the other is missing entirely.
I tried multiple handles from the hardware store and none of them really worked.