G'day Patto70,
And welcome to the ODK Forums.
Best bet is to keep an eye on the Lawnmower Parts section on FleaBay Oz. Occasional lots of older Victa parts do come up there. The Victa part number for these is EN70628P.
And although he has them listed as NLA, it would be worth asking Bruce at the ODK Shop, if he might have a set or two tucked away...
He does stock the gaskets you'll need, in any case.
https://www.outdoorking-forum.com.au/engines...cta-two-stroke-125cc-.040-rings-en70628p