Interior fittings screws

[megpep@hotmail.co.uk]

Hi,
I have a 1970 traveller and have removed various bits to restore or replace, sun visors, door pulls, rear view mirror and have found every single screw is different. Even the 3 screws for the mirror bracket has different lengths and threads. Can anyone recommend what screw type/size would be closest to the original used, assuming they should all be the same, or a suitable ones to use please, Many thanks.