Fitted a part from a Quatroporte as it was very much cheaper. The part I used was the part the front cover clips on to that allows some rotation, not the actual jet part as the angle is set diffrent. See picture of repaired parts.
I had to replace one on the Turbo last year. It blew off activating headlamp wash at 80mph in a howling gale and sheets of rain. Cost £60 - only available from Porsche Main Dealer - plus small labour charge by taking the lamp out (simple task with the supplied tool in the toolkit). The GS will be £100 as it has to be sprayed to match (the Turbo one is chrome effect).
I hope I never lose one on the GS.