G'day Speedy,
That part number corresponds to a M16x1.5 thread glow plug, according to every online listing I can find. The pic looks like 16mm, too.
The voltage rating is a bit of an oddball, so finding an aftermarket replacement is likely to be difficult.

Check this 'fast parts' list from the Oz Iseki agents; two different size glow plugs are listed for the TE4270 - page 33.
https://agconet.agco.com.au/agconet...%20%20-Iseki%20Fast%20Parts%20Guides.pdf

Looks like there is an Iseki dealer in Bundaberg, so they would be worth trying. http://www.iseki.com.au/iseki-dealers

Cheers,
Gadge

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