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The one I bought was advertised for an XK8 with correct thread. Plug did not fit but i mangaged to get a connection and while the temp was actually 6 deg C the electronic thermometer (Scangauge) showed 40 deg c. Clearly the NTC was incorrect . The engine ran very bad .
So we still have the question whats the right sensor part number ?
I appreciate that it's extra work, but the crossover pipe (AJ85885) isn't badly priced and comes complete with a new sensor. It's also biodegradable plastic and prone to splitting so worth considering if your existing one is is of any age.
I have an old one somewhere in the replaced parts museum. I'll try to locate it and see if it has any identification.