I came across a 3d model of a GTV headlight adjuster block the other day.
After tweaking it a bit, I made it a universal fit for high and low beam, and 3d printed myself a new set to replace my existing ones that were worn out with stripped threads (and one had been replaced with a wooden block many years ago)
You can download the 3d model here (https://www.thingiverse.com/thing:4548545).
If anyone needs some of these and doesn't have access to a 3d printer, I can print out a few more.