School me on roof racks

OK so here's the deal. I just recently purchased a used A.R.E. cap/topper/camper whatever you wanna call and it has 5 foot tracks mounted to the top for roof racks. I'm not sure if the tracks are Thule or Yakima brand or if it even matters. I have looked on both manufacturers websites for info on what I need to no avail. I also went to my local dealers and they just wanna look in the book so the first thing they ask is the type of vehicle (which obviously has nothing to do with the cap) and when I tell them that it's irrelevant they look at me like I have 10 heads. Can anybody help me please? It would be greatly appreciated.