Arca swiss F line 4x5, binocular viewer 140/171 ?

[archivue]

Is there two differents models of binocular viewer for the current Arca swiss F line 4x5 140 and the 171 ?
Thanks

[archivue]

I have the answer for my own question, so i come back to share it !
the answer is that in 4x5 all F line cameras share the same binocular viewer !
it didn't change !

In 6x9, it's a specific one !

So the upgrade is cheaper than i thought !