Porsche 20x??
The ONLY way to determine the correct gear for your application is to remove the speedometer and count the teeth of the old gear or the next gear in line. The VIN does not help.
Porsche 2nd Option in 1991 only
You need to remove your old gear or gears first to determine which part or parts you need to order. You will either have a single 20x?? gear or a gear and pod combination.