Found the box and receipt!
Cardif Motorcycles Ltd, Cardiff CF11 8JQ
The receipt says Yam Xt1200Z ABS/USB 23P1 22010 Ignition Coil Jap
The box says
Tour Max High Performance Equipment 713418 Plug Hole Ignition Coil IGN-218P Made in Japan
The bike was very much better for fitting them.