Hello,
The screw size (mm) is M2.5x5.5 and all screws located on the bottom are the same. I also give you the part number of this one:
| Part number | Description |
| 86.MSTN7.002 | SCREW.M2.5X5.5-I(BNI)(NYLOK)IRON |
May be this one should be appropriate. Check the head diameter.