Irretiert only took me the size specification. The structure is, of course, in 3D and since in my opinion a unitspan is insufficient. I called the manufacturer and demand there.
The nice lady at the other end told me that relates the dimensions of these articles (also applies to the other rock formation 88xx) to the longest dimension.
The dimensions are in the correct form: about 21cm wide, 13cm high and 10cm deep.
From my side, a clear recommendation, at the price you get top goods!