I decided to call Bob Turner who’s company (based in East Peckham Kent)specialise in repairing and modifying seats on cars and bikes.
He added padding for the plank of wood that was on the back. He also added orange stitching to match the orange stitch wheel rims. Although the seat looks a bit weird on a sports bike- I hope it will make the journey a little more comfortable. If anyone needs info then let me know.