That's pretty shitty of Cooler Master if they were advertising having 4 clips.

https://www.amazon.com/DGHAOP-Computer-Mainboard-Radiator-Accessories/dp/B0BRQ86B9T?th=1 Are some that look very similar but you should measure them and I can't guarantee they will work. Maybe someone else had this problem here and can verify one that guarantees working. You could also try jerry rigging with some electrical tape and/or paperclips.