i have a OEM vanagon roof rack..its like the older VWOA bus style..a "basket"
type w/ tubular construction, and it has little legs that rest in the
raingutters, and clamps that use wingnuts and clamp to the raingutters..
its the 2/3rds style
and no, im keeping this one :<)
btw -  an older bus rack can be made to fit if you bend the legs out a little
bit (heat the metal up w/ a torch to keep it from kinking)
chris