Help identifying catalytic converter

  1. My model of MX-5 is: 2003 NB Nevada 1.8vvti
  2. I’m based near: Sheffield
  3. I’m looking for technical help or recommendations on: What cat I have

To summarise a tragic story, I had an MX5 which went off to be scrapped in rather a hurry but I have a few bits left from it. I was told by the scrapper to get the four-digit code from the heatshield on cat and he’d be able to get a price for it.

Unfortunately, due to rust I can only see the last three digits, “A 1 6”.

Is anyone knowledgeable in this field able to fill in the blank or offer any advice?