Maybe one of these similar products would be of interest:-
Milano Lithic - Square Rectangular Shower Tray Riser Kit - Up to 2000mm x 1200mm
Milano Lithic - Square Rectangular Shower Tray Riser Kit - Up to 1200mm x 1200mm
Milano Lithic - Square Rectangular Shower Tray Riser Kit - Up to 2000mm x 1200mm
Milano Lithic - Square Rectangular Shower Tray Riser Kit - Up to 1200mm x 1200mm