Based on this product's specifications, here are some alternatives and similar models
Side panel SCHROFF 900T RAL 7021 — metal enclosure side panel for SCHROFF 900T chassis, color RAL 7021
Summary description:
Replacement side panel designed for the SCHROFF 900T chassis, finished in RAL 7021. This metal enclosure panel fits the SCHROFF 900T series to protect internal components, provide structural support and maintain EMC/thermal characteristics of the cabinet. Suitable for server, telecom and industrial rack applications where original SCHROFF parts are required.