Screws for Fans?

Ok, so the two screws (or pins) that hold the two fans to the radiator (at the top corners) somehow shook loose and fell out. I have no idea what size they are. Can anyone give me some advice as to what they are and where I can get them? Thanks.

1986 Porsche 944 Turbo
http://www.cardomain.com/ride/2076246

Are they all gone? usually I take one to the hardware store and match it up. I usually have to file the tips off to get the right length.