Simon, thanks for taking the time to acknowledge that my thinking on wiper aerofoils is not entirely flawed....

Your memory is correct they were de rigueur for all the Mini & Escort lads in the 70's
Modern copies are available
https://www.ebay.co.uk/itm/395349970282I believe you get a discount if you order them alongside the sellers other item for sale: custom vinyl name decals that go across the top of the windscreen, proclaiming the name of the driver and that of his lady passenger!

I must admit to having a chuckle when I see drivers with their instagram handle stuck to their side windows, letting all know the link to their social media profile; however, then I ponder some of the questionable 'mods' we did to our cars in our youth and think, well, the circle just goes on!