All 10 Soffitten function (ensure correct polarity). Replacing them can be only in the mirror and Hauptbelechtung front. The remaining lights (4x entrance light, footwell 4x, 2x rear seat, 2x trunk) must be replaced Duch 36mm or 38mm festoon. Since contacts bend brings nothing, because the space in the case is not enough. As for brightness, they are felt twice as bright as the original 5W u. 10W bulbs.