Based on this product's specifications, here are some alternatives and similar models
Rittal TS 8601.680 Adjustable Traverse for TS/SE/CM/TP/PC/IW, Steel, Black, Height 70 mm, Pack of 2
Summary description:
Rittal TS 8601.680 is an adjustable traverse made of steel in black finish, designed for compatibility with TS, SE, CM, TP, PC and IW enclosures. The unit has a height of 70 mm and is supplied as a pack of two. It provides structural support and mounting flexibility for 600/800 mm depths in server, control and distribution cabinets.