Based on this product's specifications, here are some alternatives and similar models
Rack adapter Rittal SV 9635.390, polyamide housing, light grey, 258 g
Summary description:
Adapter Rittal SV 9635.390 for equipment racks, made of polyamide with a light grey finish. Lightweight accessory (258 g) designed to mount or adapt components within server or network racks. Suitable for industrial and IT cabinets where durable, non‑metallic mounting parts are required; provides simple installation and corrosion‑resistant housing.