Pretty sure its an 83 model with 84 model side plates & aftermarket rear guard. (Semi-edit because Bahnsy posted while I was typing: Tank & rad shroud are 83).
In my experience, older Kawi parts are about 100 times harder to get than Yamaha, Honda or Montesa parts of the same age. The motors didn't change a whole lot year-to-year so with some time & effort you'll often be able to find something that works and is available, but plastics are a consistant PITA (unless Nightmare Racing is doing repros of the bits you need).