As Phil says 10,
but
its 12 if you are fitting a GRP rear tub .....the ends of the extra spar ( that I call GRP1 ), tho I would suggest welding steel plates on the end of this spar ( as Gus & Dave have done ) as if fitting a plastic end cap it "May" make it a very tight fit for the inside radius where the GRP tub meets that spar ( the plastic end caps tend to sit a approx 5mm proud).
cheers
andy
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