There is a large black plastic hose that runs from the air cleaner box (behind battery) to the intake manifold behind the engine. It is on the firewall behind that hose.
Some early 71' & 72' VW Super Beetles had flat windshields, later bugs had curved.
Major changes were MacPherson struts and changes to the front skirt. The struts ride smoother but can be a...
It is located under the front hood on the driver's side. It is up close to the dash on the driver's side. There will be a little holder for it with a strap holding it down.