Maybe you could get them through support. Haven’t tried/asked yet myself.
But I do have the same problem and haven’t been able to find them anywhere available.
I did however succeed in printing them, I’ve been using the printed version since:
Obviously not as strong as the original, but they have been holding up fine for me. (Do note that I keep a wasteboard continuously mounted and put the printbed on top of that. So I hardly ever unscrew them.)
Don’t overtighten the plastic version, I would recommend PETG or ABS in stead of PLA. I assume if you screw/unscrew it often they will need replacement every now and then. Mine have lasted for about 4 months now. (had to replace them once since that post)