Fischer recessed WC and bidet fixing kit (2) | Wolseley
Vitra | Fischer - Concealed WC Fixings for Wall-Hung Pan - YouTube
Fischer 9 B, WB 9B, Concealed Fixing for WC and Bidet, with Access from Below, 2 Devices wb9 b with Tube, White, 2 Black funnels, 2 Pipes No Kind, 34-47 : Amazon.co.uk: DIY & Tools