Red top and bottom with yelow paper (pink paper for the short ones) is GA spares after market. Go to some old style shops - the less flashy ones in the old asbestos roof warehouses run by old guys who have been working on them for decades.
The one I went to had the genuine Victa filters - think I was paying $3.40 for the long ones and $3.20 for the small ones. Shame he retired in december - on the plus side he found some old G3 carby parts in an old box for me shortly before going.
Now the really hard to find ones that are light blue and have 'made in Australia' on the top - very hard to find cheap
GA supply the aftermarket filters for about $1.5 - so please don't pay $12 for one