Vin?....
You have two numbers. One is the EIN (engine identification number) the other is the HIN (hull identification number).
What your looking for is on the back, lower right hand corner of the ski. The last two digits signify the year model.
When you go to our parts index, you'll use the selection for type (boat or ski), then you'll look at the year, then the model. As for the designation number, it shouldn't matter. That applies to models made in split year. Normally, it's only a designation, nothing to do with your component parts.