Based on this product's specifications, here are some alternatives and similar models
Thermostatic Cartridge Knob FERRO RKPT1 compatible with thermostatic inserts RKPT2
Summary description:
FERRO thermostatic cartridge knob RKPT1 is a replacement control knob designed for use with FERRO thermostatic inserts (model RKPT2). It serves as a user interface for adjusting temperature settings on compatible thermostatic valves. The knob fits specified cartridge geometry and provides manual control for bathroom or kitchen mixer thermostats where the matching insert is installed.