1997 daihatsu terios

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Hi. New to the forum. I live in Malta, so please forgive the intrusion.
I have this daihatsu. Love it. Just passed its VRT ( mot,). Now the lambda 02 sensor to the manifold is causing problems.
My fantastic mechanic will fit the sensor, if I can locate one.
Its unusual in that it's a 12mm one wire sensor.
The usual suppliers can only supply 18 mm, even in Japan they are trying to sell me an 18 mm one, saying it was made that way!
The car, as I said ,1997. Exported to Europe 2004. So I guess made foir the home market? Would this make a difference?
Anyone any ideas to help please?
Thanks in advance.