Azide

Anyone know where to stick typical European headlight deflectors on bugeye lenses?

There aren't any 'datum' markings on these lenses except for a single small circle.

Have searched for past threads but with no luck.

Will probably end up turning the lamp adjusters down and slapping a load of black tape on as usual, but it'd be nice to have a proper solution for once.

Cheers, Azide