bushel length of vf 1000 carburetor

hello ! i’m french and i got a vf 1000 f2 since four years now.
It’s getting harder and harder to find parts for these models and I have a leaky carburetor membrane. my VF being a French model it is clamped to the bushels and I would need to know the length of an unclamped bushel to have it remanufactured

so I would need the total length in red on my photo
can somebody give me that ?

These may be of use to you.