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There are several different types of side rails or rails.

The Sport came without any rails at all but rails were optional.

1. Side Rails
2. Wrap around Side Rails with seat back

There are many photos of just the Side Rails in the members personal pages.
I looked for some that had the Wrap around Side Rails and seat back but all I could find is this version that came standard on the Sourpuss model.
http://www.whalercentral.com/userphot...hoto_id=96

Someone may have modified the Side Rails that you have and that is why you are having difficulty in finding something that matches.

Let us know more about what you have.