Based on this product's specifications, here are some alternatives and similar models
Rack rail kit Rittal VX 8619.450 — steel, grey, width 1554 mm, pack of 2
Summary description:
Rittal VX 8619.450 is a rack rail kit for server and network enclosures, made of steel with a grey finish. The kit includes two rails (quantity per pack: 2) with a width of 1554 mm, designed to support mounting of rack equipment and accessories inside VX-series housings. Suitable for organizing and securing IT hardware in datacenters and industrial control cabinets.