Just a word of caution...
Almost every NGK Iridium plug(s) that were purchased at Rock Auto, Autozone, or Amazon, that folks have brought me to install, have been cheap, poorly made, knock off plugs!
I've replaced hundreds of them, that folks paid as much as $25 dollars each, or as little as $7 dollars each at autozone etc.
go to the NGK sight and study it carefully before you install your plugs to prevent possible damage to your bike.
I've seen some with short shoulders, some with long shoulders, some with too many threads, not enough threads, different length insulators, etc.
Pay attention to the plating, finish, placement of the logo, the weld around the tip (or lack of one) etc.
I've seen some that were even purchased at the parts counter at the local Honda shop, (parts guy said they ordered them online) that were fake.
I won't even use NGK anymore!
I've switch over to ND Denso plugs, because so far, I've not found any fake ones of this brand yet (does not mean it won't happen soon).
Buyer Beware