hello, I recently bought a topcase for my piaggio zip. unfortunately it doesn’t fit on my scooter, although the seller has indicated that the frame for piaggio zip, sfera, tph and others is. the holes of the mounting screws have a different hole distance. my question: are the places type-dependent? or is there at piaggio suitable stands for different models? or otherwise asked, are there any items that correspond to the description of the seller? my zip is bj97 (o) the bj98?)