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I guess I wasn't too clear on my situation, let me try again. My boat is a 15 Sport. I have the bracket as Phil shows, fixed. I really don't have a need for a slider track. The bracket location has no wood underneath, only foam.

Each bracket accepts two fasteners, in my case 10-24 screws. Each screw threads into a rubber grommet that sits in a rather large diameter hole (3/8"?) drilled in the gunwale. The brass threaded female piece that the screw engages is inside the barrel of the grommet. The system uses the distortion of the rubber that occurs when you tighten the screw to keep it from pulling out of the hole

I either need to find a direct replacement (my hope), or install a stainless toggle in the hole that accepts 10-24 threads, or fill the hole and start all over with a different fastening system.

Does this make sense?