Nissan being the company that designed and manufactured the Datsun 1200, still has many parts for it. However, starting in ~2005 they started to reduce old parts, but still many parts are available.
80886-H1000 Rubber - Door cover RH 80887-H1000 Rubber - Door cover LH 80834-H1000 Spacer - Weatherstrip. Front door RH 80835-H1000 Spacer - Weatherstrip. Front door LH