Help please, cabon fibre seat hump !

That works out to nearly £400, you could virtually the full SDR seat unit for that money over here!

The seat hump simply sits on the seat but has four little brackets which hook round the seat and bolt to the underside. It has a rubber strip along the edge where it sits on the seat.
I don't have photos of the underside unfortunately, but this may help for getting a shape...

not worth the money, its very fragile and makes getting the seat of a real pain