I have noticed many different valve stems and caps on our DeLorean's wheels. Some have long black plastic valve stems, others have short black ones, others have black plastic with a white plastic air release piece and yet others have what appears to be stainless steel valve stems. The caps I have noticed are black plastic, brass, stainless steel and none at all on the stems with the white air release piece. Can anyone tell us what the factory produced by Vin #? It's a concours issue. Regards, The Silver Fox Vin #'s 01149 & 10788