Hello jlowe1973

A warm welcome to these forums!
I am very pleased that you have chosen to restore your Rexmow.
These are import - but forgotten - lawnmowers of a unique Australian design.

Your machine is a post WWII machine that would date from between 1948 to the mid 1950s.
Because this machine has the newer tubular handle, I feel it would date from about 1952.

To answer your question, these machines - with the tubular handles - would have only come
with the rubber tyres. They were bonded to the steel wheels. No parts are available.

Here is a picture of a bonded rubber tyred wheel:-

[Linked Image]

[Linked Image]

A History Record is available for the Rexmow HERE.

Hope this helps.
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JACK.