I'm not sure what manufacturers tracks that are on the boat? Usually they are Traxstech or Bert's, either way they are the same size tracks and you can use the downrigger bases from either one that they both sell. They just slide in and out, nice stuff.

http://www.traxstech.com/

http://www.teclausa.com/bert/products.html

Around here in Illinois you can buy their products at Bass Pro Shops or online.

I have a boat I got from Ohio, it has these tracks on two sides. I am wondering what I need to purchase as far as a base to install down riggers? I am in NC and we dont use these rails. Any advice would be great, I have searched sites up and down to find out more.