Some later 109 nav lights had coloured lenses so it wouldn't be outlandish to just paint them. If you want clear ones, cut out the lens, roughly shape a piece of clear sprue to the shape of the notch and glue it in with CA. When set, file and sand the sprue to blend it in with the surrounding wing surfaces then polish with fine wet/dry paper. Finish with brushed on clear gloss. If you want the bulbs, drill a hole in the sprue and add a red or green dab of paint in the hole before gluing the lens.
Of course, this will mess up your painted surface and should be done before painting.