The 1965 Fastback seat back latch is different than early 1966 latches in that the 65 style included a bumper. Sometime in early 1966, February or March, the bumper style re-appeared and continued thru at least 1968, with the bumper style also on the left hand side. The knobs were also different between 1965 and 1966, as well as the four screws, 53008-S13 for 65, and 53016-S13 for 66, the difference being thread pitch and length. They were not painted.
Jim