Based on this product's specifications, here are some alternatives and similar models
Mounting kit Rittal AX 2508.020 — stainless steel/white, compatible with Rittal AX, KX, AX IT, EL (4 pcs)
Summary description:
Rittal AX 2508.020 is a mounting kit for server and network racks, supplied in a pack of 4 pieces. Finished in stainless steel and white, it is designed for compatibility with Rittal AX, KX, AX IT and EL rack systems. Lightweight (package weight 452 g), the kit provides mounting components for installation, retrofitting or maintenance of enclosure equipment.