What type of spark plug do I need for my Kawasaki Bayou 220?

I just bought a 1989 Kawasaki Bayou 220 4x2. I wanted to change the spark plug on it, but I cant find on the internet what I need. Does anyone know?
What type of spark plug do I need for my Kawasaki Bayou 220?
Champion stock number 809 part number RA6HC the gap is .026

or ngk iridium stock number 6681 part number DR8EIX

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