HP Pro Desk 400 G9 SFF hard drive screw

Hi!

I need help to find an EU source of HP hard drive screws (Torx15 exactly) for a HP Pro Desk 400 G9 SFF. Is this screw a special HP thing or some common thing and easily findable? Do somebody know the exact dimensions of this screw, because I'm not sure what I need to exactly searching for. Thanks in advance!