Several thousand vehicles from German luxury car brands Audi and Porsche are stuck on board ships at ports in the United States because of customs issues involving a Chinese-made part. Both brands belong to German auto giant Volkswagen (VW) and include parts manufactured by VW suppliers in western China, including in the Xinjiang province, which has been the focus of widespread international attention and human rights concern over China’s treatment of the Muslim Uyghur minority. “We are working to rectify a customs-related delay in the delivery of certain Volkswagen Group vehicle models from U…