Russ, A filter should be on the pass.side, under the hood,mounted to the inner fender well. About 3-4inch dia. and about 8-9 inch long. Follow the fuel line from the Injection pump . A water separater res. should be under the car right in front of the right rear wheel mounted on the body. Stick with org. VW stuff. I don`think they have moved them very far away since I quit working on them. You have to have ALL the proper fittings in good shape to make the bumper cover to stay put.