I am selling a full roof rack from Yakima made according to the specs from their website.
It also comes with a custom rear rack to accommodate longer objects such as Surfboards... It works wonderfully and I have carried my longboard from Seattle to Wesport a lot of times and I could cruise at 80mph.
The bottom of the rear rack stays attached to the car and the big 'T' can be removed very easily (3min).
here are a few pictures:
This is the full Yakima Rack without the rear custom rack: