AM5 & AM4 Universal CPU Cooler Mounting Bracket Kit - Includes 1 Full Backplate, 2 Sets of Standoffs & 2 Sets of Screws for AMD Socket

That part comes with the motherboard. Has nothing to do with the cooler manufacturer. Buying replacements would be the easiest as it's unlikely the motherboard manufacturer will provide one under warranty since they'll just deem it physical damage and deny it. https://www.amazon.com/ECKDZMY-Universal-Cooler-Mounting-Bracket/dp/B0G4R6LG3R The above kit comes with the brackets for AM4 and AM5, plus the AM4 backplate. You only need the brackets but they're not sold separately.