2 thread blinker what is allowed, what is not?

Hi! sometimes a stupid question many U.S. vehicles originally have posi and blinker in the same chamber (with 2 faige blinkerbirnen) have heard the last thing that the pears are legal in Germany because otherwise nothing fits in the frame, but you can only connect the thread for blinker and not the thread for the position lights. how is the legal status? already who had problems with it? thank you