The Wiper Blades that Morgan use are of, well, limited use.
They seems to smeer rather than wipe.
Now 7.5" blades with 5.2mm bayonette connections are not exactly common, but TEX Automotive offer 8" ones with a "modern" sprung back to the blade.
Look at Cat No B05108 about half way down the page, click on the photo for a big picture.
Blade I'm seriusly thinking of getting a set. The extra half inch should fit OK,
Has anyone else tried these?
Could they be worse? I doubt it.
Would they look "right"? Not certain....