If you would list the dimensions of the glass cut-out with the cat flaps so that one could also compare this before ordering, one would not have to open the original packaging or would not order incorrectly. These dimensions are missing on the CatMate Elite and many others. The flap in question is larger than the standard 21.2cm in the cut-out! Unfortunately it did not fit by 5mm. For this, 16.- deduction because it was unpacked, although the box was not taped shut, I don't know. I'll probably take pictures of how it arrives next time I order it, and in the event of a deduction, I'll seek legal recourse.