A few years back I traded my B17, for a Selle San Marco Rolls, and for the bike I took the B17 off ,
I got a made for Brompton Fizik Vitesse, They're black, saddle rail bend a bit different..
I had a Vitesse CP3, a softer density foam with a gel window , Now I have 4 of the ones Brompton got made, thinner, denser padding..
Saddle was an option on the light weight Titanium parts equipped -X models..
Typical Vitesse marketing seems to be aiming at women so pink & white 'Pleather'.. covering.
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