Based on this product's specifications, here are some alternatives and similar models
Brake pads Clarks CLA-VRX862C for Shimano Ultegra BR-RS805 BR-RS505 sintered metallic
Summary description:
Clarks CLA-VRX862C sintered metallic brake pads compatible with Shimano Ultegra BR-RS805 and BR-RS505 calipers. These metal-matrix, sintered pads are designed for disc brake systems to provide durable braking performance and improved wear resistance under varied conditions. Suitable for road cycling where consistent stopping power and longevity are required.