The first vitos link posted for the forged piston is for a stock cylinder resleeved to a big bore. Works fine in that application but not in the vitos 240 bb jug. The second vitos link posted for the cast piston is for the vitos 240 bb cylinder with the 12 port design. You would have to call vitos but I believe the piston pin height is different along with other things. The wossner pistons are good pistons also. They are more designed for the ct cylinders but will work in a vitos bb cylinder. One of the main differences being that there is no intake bridge on the wossner piston, open intake bridge like the ct cylinder. I run both pistons you are speaking of.