If you'd have asked only 6 months ago I had some of these from my old case in a box of old parts! Sadly I chucked them as the case is long gone.
Best I can suggest is contacting the CM European store.
https://store.coolermaster.com/eu/haf#/pageSize=12&orderBy=0
I've had good luck with them getting parts for older cases that weren't shown on the website, but I guess it depends how much old stock they have left.