Yes there is a metal tube with a fitting similar to the one you linked for NPD, I think the correct is available from Deadnutson (?), (there is another thread on this topic that discusses it, may be able to alter the one you reference).
There is a brass fitting that screws into the second vacuum port on the back of the aluminum COBRA intake that the metal tube screws onto. These are available too, NPD and others, the originals have a W stamped on them.
Will look for links and images, these are 4-speed examples. (not an expert - just trying to help)