Sorry for looking like i hadn't read or acknowledged your very helpful reply
I have been bowled over with sever bronchitis and offline for a week now.
So i took your advice and ordered some specifically for the XTZ.
In a weakened state (can you hear my violin?) i ventured out into the cold of a Hessen Sunday and fitted them. The sudden slipping clutch threw me for a few seconds (i hadnt realised this is my first non hydraulic clutch lever ever!) after some adjustment its working well.
The levers fitted as they did on my GSX1400 (same factory i would assume) i.e very well and feel nice and strong.
Good call!