Maybe one of these similar products would be of interest:-
1300-1700mm Leg & Panel Shower Tray Riser Kit Pack - White
1000mm Quad Riser Leg and Panel Shower Tray Riser Kit Pack?- White
Shower Tray Riser Kit | Suitable for Square & Rectangle Anti-Slip Shower Trays | Leg Kit
Eacon Shower Tray Leg Kit | Low Profile Shower Tray Leg Kit | 1300mm High | Trays Over 1200mm
Shower Tray Leg Set & Plinth Kit - Slate Grey - 1700mm & 1000mm Panel