SPARKPLUG help, by Brand/Model

we stock a fair few bike-specific tools: oil filter wrenches, Torx Key sets, tire-spoon / spanner combo's, etc.

getting a few inquiries for spark plug spanners, but before stocking, I know there are a LOT of different sizes!
For example, the old 1200GS/A - the PRE-facelift has one size spark plug, the POST-facelift has another size!

So any help on this list - and maybe getting it stickied - would be appreciated!  :thumleft:

Aprila
BMW
Honda
Kawasaki
Suzuki
Yamaha
etc
etc