Malcolm,
Good to see you on the weekend.
I believe most strongly that is the same element as used in the fuel filter for the Ferrets. It goes by the name of a Vokes fuel filter.
They are available from the UK from Marcus Glenn as well as Australia however Khaki Imports in the US may have stock also.
The link to Marcus Glenn here
https://marcusglenn.com/parts/daimle...ilter-element- shows the element without the cage assembly around it and one can re use the old cage but it is a pain.
According to Allan Duffy you have tons of Ferret spares on site so maybe you have them already.