There appears to be several models of the E39 light available. The outer most marker lights on some E39s [like I bought from Sport-Tuning] have clear lenses and single filament bulb sockets. To get both marker and turn signals, you have to modify/change the socket and buy a two filament, amber bulb. You then have to decide what part of the light assembly you will use as/with your day-time running or marker lights [eg, halo only, 3-LEDs only, both or none]. Some owners have expressed concern that the E39 doesnt give you a true side-view marker light for vehicles our size--required in some states.....
2003 40' MDTS
Garden Ridge, Texas