K10 Flare nuts

the braking force balancing valve has a hanfull of flare nuts ...


most of them are 10mm but there are 3 ( one on the bottom left facing and two on the bottom) that are a different size!!

i thought for a minute that some garrage may have fitted these three during a past pipe change...but it is the same on all 3 of my K10s

1. Why are these ones a different size?
2. What size are they I cant get any spanner to fit!! (May be I was just tired.....)

cheers guys
 
most brake pipes are 11mm or 7/16", Nissan probably just got bored or the increase in size is due to the fact that 10mm just ain't big enough!
 
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