Based on this product's specifications, here are some alternatives and similar models
Side panel Rittal CS 9781.880 — aluminium, grey, pack of 2
Summary description:
Rittal CS 9781.880 is a grey aluminium side panel designed for CS enclosures. Supplied as a pack of 2, this durable housing component provides protective coverage and enclosure integrity. Suitable for industrial cabinet construction and electrical enclosures where corrosion-resistant, lightweight aluminium panels are required.