All 3 screws are 5mm thread length. The 2 side screws are 2mm diameter. The middle screw is 1.6mm diameter.
The 2mm screws have 12 threads over their length. The 1.6mm screw seems to have 15 threads over its length.
Looking at the top screw it seems to be non-standard. Looks finer pitch than a standard M1.6 pitch of 0.35mm. Has anyone actually replaced one of these yet? If so with what specification of screw and from where? Thanks