Just wanted to say thank you
My screw arrived on Tues - havent fitted yet but its here
OK it seems that if you have an aftermarket rad these may not fit! At least one winner has told me theirs doesn't fit!
MGR only specified PYP100500 with a thread of M12x1,25
Dieter also says that a Suzuki bike plug p/n Suzuki 09247-12106 fits. It's M12x1.25 as well.
So if you try it and it doesn't screw in easily then DO NOT FORCE IT IN!!!!