Rear Wiper Motor Bolt Size

Does anyone know what size bolt I need for my rear wiper motor? The missing bolt is for the hole closest to the rear window. Here are pics of which hole I need the bolt for..

http://i72.photobucket.com/albums/i1...pszenoidab.jpg

http://i72.photobucket.com/albums/i1...psfswyudxx.jpg

Bolt should be the same as the other two.

I probably have 50 of those in my Mitsubishi bucket of bolts. LOL