I did a bit more wiper research today. There are two different lengths of blade, short for 2 seater screens and slightly longer for 4 seater cars with the taller screen.

However most if not all of the newer cars now have the taller 4 seater type screen and longer blades.

The shorter blades are shorter at each end, so if used on a taller screen you will lose swept area at the top of the screen (not good) and they might still be too long at the bottom (below the pivot).

The only answer to stop the blades going over the bottom of the screen surround is to shorten the blades at the bottom end below the pivot by about 1/2".

Has anyone else done this mod, I'm going to order some new blades and try this. It looks very simple to chop the bottom and crimp the end, to stop the rubber coming off. My blades have plastic end caps, these could be removed and glued back on.