Hey Tyler,
yep mate it's the Fairlane gas tank. I have been driving it on petrol after filling it at 84.9¢ a litre while LPG was sitting on 79.9¢. A it consumes gas at 17% greater rate it was cheaper to run on this petrol. I managed to use my fuel saver app to find gas at 69.9¢ not too far from where I collected the mower and filled it up before driving home on petrol and gas.
Back to the mower, the wheels have better tread on them than the pictures suggested and I've yet to take a look at the bowl bolt. The engine cover looks nice on this so I am hoping I can get myself at least one functioning Tecumseh powered Victa out of this buy. Who knows, I may have a pigeon pair in my hands!
Do I have to find compatible scrap plastic to perform a weld or can I just fuse the existing plastic of the tank with a soldering iron tip?

EDIT just went for a sojourn into the cold and can confirm it does. A fiddle with that could make the difference?

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Ahh, if only victa had kept producing the thumblatch catcher series, they would be in better shape today!