I'm not sure about a fastener's joint in sydney.

But i use specialty fasteners here in canberra and can get anything. If you want send them an email with the bolt's you need what type i.e high tensol and head type (castle nut) plus thred i.e 10x1.25 and they will send them to you.

http://www.specfast.com.au/contacts/

Otherwise there are these boy's in kirrawee

http://www.southernfasteners.com.au/contact

http://generalfasteners.com.au/contact-us/

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Just Found these guys in sydney

http://aerobolt.com.au/contact/

So i'd say give them a call and get the bolts sent your way..

Hopefully this helps