I bought a brand new 70 Breganzie 750 SFO here in Canada. It came with both the Flat Dual and Couture Letter Box Single saddle.
Had to pay extra for the Letter Box Seat.
I'm sure you can adapt the Single 750SF Letter Box seat to fit a Jota (and for any motorcycle for that matter) with a little knowledge of fiberglass reconstruction and flat bar steel ingenuity.
Love that single SF Letter Box saddle, Mounted it for decades ;o)
To say the truth, the Single Letter Box Courier seat were not particularly well built and some ingenuity is required to make it a stable saddle.
Michipons: You really have to work on your link presentations because it doesn't work - My Avatar shows the Letter Box SFO saddle ;o)
Take your time and re-edit several times to get your point across - Be Persistent. All though Laverda Forum Members tend to be belligerent we are indeed patient - That's what it is to own a Breganzie + Don't let the 3 Cly Members get in your way ;o)
I do not know how much of a mechanic you are but I could reach close to 8000 rpm with my 70 Breganzie Twin on a shift with a top end reaching over 120+mph down ANY STRAIGHT. You need a good Saddle to do that with your feet on the Pegs.
3 and 4 Cly Riders don't admit they lost out to a Twin on the track.