I don't remember the name either, but I think it is more like a C-channel with lips that is usually built into the floor. The ski cross bar has a T-bolt that drops down into it to tighten against...
Just do a search on e-track as it is sold many places. Mine were very long .Have seen them in farm supply stores in 4 foot long pieces. Many different things made to hook up to it.Still dont know if it is what you want. Most all truck places and dealer ships have it or can get it also.