Found an old book at the library on the original Quattro, and in several photos of the engine it shows what appears to be an aluminum valve cover with 'Audi' cast into it. Sure would like to have one to replace my rusted/ugly stamped steel one I have on the GT. Was this ever available here in the U.S., and if so, on what model(s)? Dwight V. 86 Cgt, 89 Jetta GLI 16v