Based on this product's specifications, here are some alternatives and similar models
Bettermann Rapid 45-2 GK-IH53165RW Adjustable Internal Corner for Cable Trunking, White
Summary description:
The Bettermann Rapid 45-2 GK-IH53165RW is an adjustable internal corner designed for professional cable management systems. This component allows for flexible installation within Rapid 45-2 trunking, ensuring a clean and secure transition at wall corners. Made from high-quality materials, it provides durability and a seamless aesthetic finish in white, suitable for office and commercial electrical installations.