I wont be able to get it locally, and if I were, i bet they will have to import the part....i can import it myself...would be cheaper and faster...

however, I bought the complete kit and it seems that either at customs or somplace one of the discs fell out of the box.

I can sure make the missing disc myself since it is one of the flat ones with no spline indentations. However, I would like to know what material should I use to fab it.

Regular steel plate will work (not mild steel)? Do I have to harden it?