Dang, good eye, hard to see but doesn't look like those screws are there!
Edit: Don't feel bad!! There is a thread you can read of all the parts we put on backwards, upside down, opposite of how it came out along with forgotten parts after everything is put back to together!! (Bearings sitting on the table and the differential is all nice and proper back in the housing!!)<-- I still do this one!! ?? ??
Sorry this I don't know but I guess it's m3x 16 or a bit longer/smaller. I just had the picture because I warned a friend earlier. You need to make sure it's the right size as to long or to short will give you other problems