The vacuum adjusters can be left disconnected until you find the switch for your model.
As far as the electrical connection goes, you will probably have to take the cover off the connector and move the pins around. This will take some work to determine which pin on the harness does what, and then determine which pin on the headlight assembly is which. You will need a test light or multimeter.
You should be able to get the lens from Fastlane right here on this site.