Measurements on landing stairs

In the picture you can see the different measurements on the four different stairs:

4 steps: 835mm * 654mm

3 steps: 625mm * 504mm

2 steps: 415mm * 354mm

1 step: 205mm * 204mm

There are two different types of forks to lower over the fender boom / hammer.

The two types of forks are respectively. 105mm or 140mm in inside width.