Based on this product's specifications, here are some alternatives and similar models
Shower Tray Frame Sanplast STS-084 for Rectangular Shower Tray (MPN 194-E1424)
Summary description:
Sanplast STS-084 is a support frame designed for rectangular shower trays. Compatible with the specified Sanplast model (194-E1424), it provides stable installation and proper alignment of the tray, facilitating secure mounting and height adjustment during bathroom installations. Suitable for professional fitting and DIY renovation projects where a dedicated shower tray frame is required.