OK, I'm clearly being a toilet Luddite! Or to be more precise I'm completely confused by the myriad of differing Geberit wall frames. Depending on the website you look at; differing names of cisterns, with flush plate or without, if with which one works with which cistern, 90/100mm adaptor included or not, wall fixings sometimes! Crikey my head hurts!   Can anyone tell me what exactly I need for a concealed cistern (lower than 900mm) for a wall hung toilet. Flush plate in brushed chrom