The large seat cushion for the V50, PV, ET3 models has, in contrast to the small version, no threaded bushes but studs. With these the cushion can either be mounted on a closed luggage rack (drillings must be done individually) or be mounted (clamped) on an open bridge with the help of the enclosed metal clamps.
As with the small version, the body is made of light but stable plywood on which the cover is stapled and glued. The black imitation leather cover is sewn all around, but has no piping. The hole stitch is 9cm at the front and 12.5cm at the back. The distance between the front and rear holes (seen in the direction of travel) is 15.5cm.