I was wondering if anyone could help me out. I just bought a used Coleman Perch it looks just like the sundolphin sportsman. The seat brackets are all rusted and the only thing reusable is the plastic seat. Any idea where to buy them it looks like they stopped selling them. 

Any help is appreciated!

You could go to your local metal fab shop. They could easily copy the original pieces and then you could just prime and paint them. If yours is just surface rusty and not rusted too bad that they will brake then that same shop can sandblast yours and you just repaint and go forward. There is no way to tell if the Sundolphin parts would fit your boat correctly.

If it's just surface rust you can clean and paint. If they are truly rusted through and trash you might be able to make something out of pvc.

Thanks for the advise