I basically cut the rear bit that sat under the hump. Cut and bent the grab rail and slotted it inside the tubes of the frame. Attached the no. plate and light unit (backing plate for this was made from a Kappa top box plate insert!). Used the original mudguard but cut appropriately. orig seat hump hinges up, giving access to the "shoulder bag strap" that holds the seat to the frame. Bit of a bodge that was only meant to be temp but its sound and looks ok so I've left it. Passed MoT ok!