Hey Kimmy. I'm in Brisbane and have an MC18 race bike. Most parts are the same as the CBR250 parts. Take the broken bits to your local wrecker and see what they have that will fit.

Alternatively, try the wreckers that's attached to the import motorcycle centre in Moss st, Springwood. They usually have a couple of NSR's in there which they can pull bits off for you, and they know where to buy new parts from.

I'd offer you my spare gear levers and steps, but I know the day I let them go, will be the day I break them and wish I hadn't!