Based on this product's specifications, here are some alternatives and similar models
Heatsink for Dell R450 R650 R750 servers, 165W, compatible cooling module
Summary description:
Replacement heatsink designed for Dell PowerEdge R450, R650 and R750 servers with 165W thermal capacity. Intended as a direct cooling module for compatible CPU/socket configurations, it helps maintain optimal operating temperatures under load and supports reliable server performance. Suitable for repairs, maintenance or upgrades in data center and enterprise environments.