Tim in Belgium

Just washed my bike and noticed that this weekend's blasting up hill and down dale has made me lose the securing bolt that holds the front brake hose splitter to the bottom yoke. Does anyone know what thread size and length I need?

- I don't fancy riding it to my local bolt shop really to attempt it by trial and error in its current state and there is no mention in the trusty Haynes manual.

Cheers,

Tim