Sirion m100 radiator drain plug thread

Hi All,

My thanks for taking the time to read.
The drain plug in my radiator disappeared today. Being Saturday evening, not much is open tomorrow. If I know the tread I can probably find a bolt to fit to get me back on the road.
Does anyone know what thread is on the radiator drain plug in a 3 cylinder 2000 model sirion?

My radiator uses m12 1.25 thread. looks like it had a tap and the tap assembly has broken.
I went to the wreckers and the plugs use a much coarser thread, maybe 1.75.

ha ha, found out m12x1.25 is a standard thread size for sparkplugs…
my radiator now has a sparkplug installed until I can get to the radiator shop