Source for 6.6 mm T8 screws for antenna plate?

While changing out the failed hard drive in my unibody Mac Mini, I lost one of the two 6.6 mm T8 screws that are used to mount the Airport antenna assembly. (These are the two middle screws. The ones out at the ends are different.) Where I can buy one or a few of these screws? I had no luck at my two local Mac repair shops.