Looking for RO faucet ceramic cartridge replacement — proprietary design, can't find anywhere

[FredricJLowe]

Looking for RO faucet ceramic cartridge replacement — proprietary design, can't find anywhere.

Your measurements: 19mm diameter

46mm height
7.5mm x 7.5mm square stem
Integrated metal hex nut collar (not a separate piece)
Photos of the cartridge attached.
Mention Danco couldn't match it

Tried searching on Amazon and eBay using searches from Claude.ai