Based on this product's specifications, here are some alternatives and similar models
Terminal connectors for surface-mounted rail DPM X-LINE, black, model STEB
Summary description:
Terminal connectors for surface-mounted rail by DPM, X-LINE series, model STEB in black. Designed to terminate and secure conductors on a surface-mounted distribution rail, these end connectors provide mechanical fixation and electrical isolation at the rail ends. Suitable for electrical distribution panels and installations requiring tidy rail terminations and safe conductor routing.