AeroPod, PowerPod and Newton

I was trying to attach my spare wired mount that I never used to my ride to work bike and I lost one of the screws. What size are they and would they be available in most hardware stores?
Otherwise any other suggestions other than buying a new mounting kit (it's $40US to Australia or $57AUD) ?

They are standard 4-40 machine screws. Hopefully you'll be able to find them in Australia.

Thanks John I'll have a look.
I am interested to see what my CDA and CRR will be for a Giant flat bar roadie with panniers compared to my wilier izoard.