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