spark plugs

[offshoremadman]

I have a yamaha 1996 L250TXRU, with ngk br9hs10 plugs,installed just found out it calls for ngk-br8hs10 or br8hs11 . what's the differance between the two? and which is the correct one for this motor?

[boats.net]

BR8HS-10 is the correct spark plug, gapped at 1mm