rear perspex strip-high mount without brake light?

Here's a kicker, there's a further variation, again from Amsterdam - this one is essentially identical to the third-brake-light version at the rear, but with the window coloured black in the front so the light can't come through, again £60 or so in the UK. And looks easy to modify to be the same as the full-price version..
these are Amsterdam-only sold versions if that helps.