The C.II4.5 also inbuild various type of Expansion Bellows, its very Important. But Other versions was not build various types, Why?.
Different type to select, technically the result also willbe diiffer.
How to prefer.........

Another One is CII4.5.To show the Max.Displacemet, I thing its very important, But higher versions it did't come that ........What is .....?
Kindly expecting your Reply Sir.