Mounting screws for WD 10EZEX

Hi - I bought a used Dell Optiplex 3020 online. It arrived yesterday, and when I unpacked it and lifted it up, heard a huge rattling noise in it. Opened the case and discovered the HD not attached to the drive cage.

Since I found no screws in the case, I’m trying to figure out the size of the replacement screws. It’s a 3.5" drive, WD10EZEX. Thanks in advance.

Is that the Mini version of the 3020? Like this one in the video I’m think it’s not and it’s a desktop and the screws for 3.5 drives are pretty much standard #6-32 UNC.