ROFLMAO!
I was thinking to myself as I came upon your post: when I was selling auto parts the same part that fits an Audi Fox and a VW Rabbit also goes on a 924 but the cost is 3 times with the Porcse part number instead of the Audi/VW number.
That's called the "Porsche Tax"
Porsche really screwed up by putting their logo on that car.
I had a friend who had a 1964 Volvo in 1979. He needed a generator, but Volvo and all the car parts stores wanted $100 smackers for a rebuilt. He noticed that the Bosch generator had a part number beginning with "113-". At the time all right hand drive (Not UK) VW parts began with "113-". So he called a parts store and asked for a rebuild generator with a part number "113-...." and got one for $50.