Does anyone know what would be the equivilant plug for a Bosch R6 spark plug. A guy that I got one of my "ammo" saws from recently gave me two new ones that he had bought for it. They look like WSR6F / R10 size plugs, but I can not find any reference to R6 plugs like them online. The only R6 I come up with is a longer micro R6 plug for motorcycles. I don't want to use them until I can verify what they are for sure. He had the usual RCJ6Y Champ in the saw. While we're on the subject, anyone have a preference for Bosch vs Champion vs NGK vs others for chainsaw use?