[QUOTE=tractors1;713247]Sailrite has everything you need. Just butt two of the plastic rails end to end and cut to length. Mount with 3M VHB tape. Their Keder sewable rope works better than the vinyl version.
While I've bought a lot of stuff from Sailright, and they are a good company, I personally would, (and did,) opt to install an extruded aluminum Keder rail as opposed to the plastic one. It's just me, but I've never been a big fan of plastic anything, especially for something that would have to endure the occasional big gust without damaging it. I installed a 7.5 ft aluminum one with 1/4" X 20 stainless nuts and bolts on 1' centers, with fender washers and nylock nuts inside. I mounted it at the level which puts all the mounting bolts inside the upper cabinets, so none of them show. I'm 6'2" and I can stand up under it, but it's still low enough to thread the removable awning in by hand without a ladder or stool.