If you have some place like a Northern Tool and Supply or Harbor Freight...some place that pretty much does tools....you can get the wire (there are different gauges, but I forget what the sizes are) and the pliers. There is a special pair of pliers to twist the ends together and tighten it down.
I generally saftey wire other odds and ends such as drain plugs, oil filter bolts, radiator cap and any bolt that likes to come out that I really really need. It's just a hang up of mine from the my old sport bike days. Road racing requires it and I about killed myself on the street once when the radiator cap came off and laid down a bunch off coolant in front of the rear tire.