Some time ago, I got a pair of
M151 Mutt vacuum wipers off e-bay, brand new in boxes. They fitted up fine to the Blitz windscreen, but I also had to buy
MUTT wiper arms to match as they are splined, not retained with a nut like the Blitz. These then accept the standard Trico blades of various widths.
It seems a lot of surplus sellers won't ship out of the US these days (and get cranky if you ask!), it might be a matter of searching until you find one that will, or a helpful address within the US to relay your purchase.
EDIT: A-ha!
Here's one that will ship worldwide. A bit more pricey, but if that's all that's available??