Where to find factory seat hinges?

Is there a place that I can buy the seat hinge peices that mount to the seat? I have a different seat that I want to fit to my bike, but I hate pulling the factory seat apart. Plus I'd rather keep those hinges on there so I can swap back and forth with just pins.

Occasionally I see them on ebay, but I was hoping for a source.

There probably isn't a source for something like that. Ebbaayy is probably the best bet. The cross-reference at Kawasaki.com might help.