Based on this product's specifications, here are some alternatives and similar models
Rack rail kit Rittal 2388.125, aluminium housing, grey, width 1153 mm
Summary description:
Rittal 2388.125 rack rail kit — aluminium housing rack accessory in grey with a width of 1153 mm and weight of 1.02 kg. Designed to mount and support equipment in server and network cabinets, supplied as one piece per pack. Suitable for use in 19-inch racks to secure rails and guide mounting of modules and devices.