It's inaccessible in the rafters of my garage. I have a bunch of boats and a form underneath were it's stored so unless I move a lot of stuff to place a ladder I don't think I can get anywhere near the rails to get a picture. I'll take a look later and see if I can get close to it w/o killing myself.
What makes you think yours are not original? The rabbet doesn't sound like it's wrong.
The rails on my 14 footer are spliced from two pieces of wood. You'd think that getting a 14 foot piece of wood was not a big deal, apparently not. If the boat were not 100% original I'd replace them.