Top bow BN7

[Alain Gigučre <agig@sympatico.ca>]

I have a question for the list:

What  is the difference between the wooden top bow (hoodstick 
retaining rail) on a BN6-7 2 seater and a BN4 or BT7 4-seater ? The 
parts list lists different numbers, but what is the physical 
difference to the piece of wood-thickness, curve, length- they both 
meet up to the same windsceen frame. Non?
-- 
        Alain Giguere
        BN7 Bits