Door Lock Cylinder Set With Keys 77-78 280ZNew pair of door lock cylinders for 1977 78 Datsun 280Z. The 77 78 280Z are different than the earlier years and use a different style of lock mechanism arm. These will only work on 1977 and 1978. Lock cylinder arms are made out of stainless steel. Choose from: 1. New pair of L&R locks that use the same key 2. New pair of L&R locks that use a different key for each cylinder Retaining clips not included, but sold sparately, PT# 800 1012.