Ok.. this has been driving me nutz all day.

I have a music production purpose built desk which I bought 2nd hand which has a whole stack of rack spaces.. problem was.. the other person started replacing the old style rack rails with the more current ones with the square holes you insert the cage nuts into.

So I originally thought.. ok.. ill just buy a few more of the new style rack rails. but I cannot find them anyware!! can anyone tell me where I can find these rails for purchase (especially in Australia) or at least in the states online, so I can have them sent over.

Or, perhaps someone can tell me exactly what size screws fit in the old style "small screw hole only" rack rails.. as all the screws i found at hardware stores dont fit, and the new style screws that i get from music stores that are used in the cage nuts which fit the square style racks are too big for this old style hole as well.. where can i buy these old style screws?

Any help is appreicated!