I forget the number right now but I use the V groved version which is easier to start with and less likely to foul. About the same price as well.
Yeh B16... I couldn't resist it. Sometimes my brain just goes in that direction as a first response. LOL
Stick to what works if they'd make a difference then the engineers would have put 2 in. Knowone that I know gets them from the factory. Most cars still running copper cores.