Jeff Snyder in the US has made a good repro 14” blade for the street cars which I believe is available at approximately US$2,500.
We are getting back onto the project this year to reproduce the truly correct spec Mk1 wiper blade in the 2 lengths .
We don’t have prices yet but this will be exactly correct with proper injection molded plastic connector blocks and with new but correct spec moulded rubber blades with all the original markings and dimples