just pick up a pack at home depot. It's been a long time since I had to so don't quote me, but I think they are 2mm. Get some with a head you can easily get a hold on to tighten/loosen. (Throw some blue threadlock on - or a nut to make sure it stays put.)
Also, you don't "really" need them.

---

My Blog - http://leegoocrap.blogspot.com