seem like you have your answer........but you are not getting the person who did it back. You could at least let them know that you aint too pleased......they may even learn something from their mistake
17inch is closest to 43cm when converted from imperial. actually 17inch is slightly larger than 43cm.
43cm tilies are available, but are commonly floor tiles.
If you need them for a wall, you can put floor tiles onto walls but you will have to make the wall is sound and will take the...