Based on this product's specifications, here are some alternatives and similar models
DIN rail adapter closing cover Alantec MKA-D-2 for MKA-D-1/MKA-D-2 modules
Summary description:
Closing cover for a DIN rail adapter by Alantec, model MKA-D-2, designed to fit Alantec MKA-D-1 and MKA-D-2 adapter modules. The part provides a protective closure for module ends mounted on standard 35 mm DIN rails, helping to secure internal components and prevent dust ingress. Suitable for industrial control cabinets, automation panels and electrical enclosures where a matching adapter cover is required.