Valmet Hunter .308 front receiver cover screw type

I need to find a screw that'll fit ...any ideas? dimensions?

www.aseinsinoori.fi/db_Valmet_Petra_kivaari1.jpg

Which part do you mean? Is it M83 or M88?

thanks for reply...

I'm not so sure what number because it's on the left side of the receiver cover just above the first number of the serial number on the receiver.

I don't know what model number because I'm dumb and it did not come with manual.

I could post a picture...

http://i137.photobucket.com/albums/q224/Bounce19712/DSC02920.jpg