Salford boy

Here is the piece placed on top of a 10p and I changed the sparkplugs myself roughly 10 months ago and I kept the old 1s and have checked if any bits were missing but they are fine

Last week got a fault saying misfire in cylinder 2 car was running rough,so i decided to have a look using a scope camera,I went straight to cylinder 2 and removed spark plug the end was badly bent anyway this is what I found on top of piston scratching my head to where it came from and what is it ? Vauxhall meriva b 1.4 turbo 2011 a14net Any ideas/thoughts please let me know Thanks Video_2024-10-25 16_30_34_615.mp4

Hi I've just signed up so hello everyone I'm after replacing my air conditioning it's for a meriva b 1.4 turbo 2011 (A14 NET) are the units a particular type/number or can I use from different vauxhall cars, Thanks everyone