I have an 81 rabbit p/u(diesel), build date 02/81. I went to the stealership today, trying to buy the injector heat shields. The computer showed the part as not being available, so the parts guy tried an '84. The part showed up not as a heat shield, but as a washer. The VW part number is 068-130-219. Will this part work, or is it interchangeable, or did I just waste my money??