It looks like your going to have to cut off that bottom edge on the rubber boot to allow the next step to sit over the top of the black plastic base on the shock absorber.Have I definitely got the right thing?
How on earth does this get over the shock?? I just played about with the gaiter and it has some stretch but not much.
Look at the difference in diameters.
View attachment 33513
Is the rubber boot none genuine?
I've done hundreds of shock absorbers for all kinds of cars and they sometimes don't fit onto the body of the shock until the spring is fitted and compresses the piston part down to allow it to go over.
By the looks of it it will never go over without cutting it level with the base of the next step up.