Victa cables were made by Consolidad Wire Products.
They are still there at Milperra NSW .
Conwire Drop them a line.
The longest G3 cable stocked now days is the one you have been sold.
A genuine Victa shop should be able to order you in one but chances all that will happen is Victa will order one from Mark , double his price and take twice as long to get it to you.
Conwire do not list Victa cables on their web page as they still supply cables to Victa.
Photograph the ends of the cable you need & send them an email.
Great people to deal with I get lots of cables made there.
