Hi CM1990,
And welcome to the ODK Forums.
There won't be much available in the way of new parts, except for sprockets [from GB Forestry; see thread linked below] and carby kits [from Tillotson]. The thread also contains a link to the Illustrated Parts List for that saw.
https://www.outdoorking-forum.com.au/forum/ubbthreads.php/topics/99575/canadien-270-chain-saw.html#Post99575Apart from that, it would be a case of keeping your eye open for a 'donor saw'; at swap meets, on Gumtree etc.