Whats it called ?

The air pipe to filter passes over the top of the rocker box on my KZN130 and on the right hand side (as you face the engine from the front) there is a plastic fixing arm that bolts down to keep it from moving about.

I have lost the bolt that fixes the arm down.
Its a fine threaded bolt and I have nothing that will fit it.

Does anyone know what is the official name of the bolt, or what the thread size is ?