How old is the faucet. Occasionally I see fixture that are supposed to be these high end luxury fixture that people spend a lot of extra money on. Then when they fail it's nightmare trying to find parts. Some of these high end faucets just use parts from a common manufacture. Mico I know nothing about except the bad news I recently read on the internet.
The other day I had customer with a Tub and shower valve that need some parts.
NOT high end by any means. He bought it at the BIG box store.
Did some research. 1st we thought it was a Danze but it wasn't the cartridge locked like one we found online. I went to the Big box store and found the cartridge there for $10. It was for a Glacier Bay valve. But I needed the small stop / temp limit cams that go on the stems and a diverter stem that is built into the valve
So then I started an internet search. It wasn't a Glacier Bay Valve. It was a TOTO valve and the diverter was a perfect match. Toto uses Glacier Bay parts or vice versa. Still can't find temp limit stops. That's the only part I really needed.
Sorry ! Didn't mean to high jack your thread. Got a little carried away.