Based on this product's specifications, here are some alternatives and similar models
PCI backpanel for Mini-ITX (2-slot) — DimasTech S0026RW, aluminium
Summary description:
DimasTech S0026RW is a 2-slot PCI backpanel designed for Mini-ITX motherboards, constructed from aluminium. It provides external access for PCI cards in compact Mini-ITX builds, aligning with standard PCI slot spacing and offering a low-profile metallic mounting solution. Suitable for small-form-factor cases, industrial enclosures, or custom PC projects requiring two external expansion slots.