Hi Chris,
All the sprockets are A OK. Now as far as the handle bar is concerned, theswe are the parts that are extremely hard to fall accross second hand as no one will want t just a frame part as then the machine they have is rendered useless. Also there isn't anyone out there wrecking Scotty's anywhere in Australia. The only avenue is to find someone that has a 17 inch model 45 that has a totally fatigued fractured chassis and buy the whole machine from them and then part it out yourself. For a machine like that I wouldn't pay anymore than $40 to $50, then that way you get what you want and get some cash back from selling the bits you don't require or strip and keep everything yourself and toss the chassis to scrap.
Sadly it's pretty much the only way out.
Cheers,
BB.