The turn signal indicator lamps have deteriorated due to exposure to the sun, water and moss. They’re supposed to be reflective silver, but they’re bleached white and literally crumble when touched. This part is interchangeable with the 99 and 900 between 1977 – 1980 (I believe).
The same goes for the tail lamps, though the lamp housing is a little more intact. The lenses are compatible between 1977 and 1980. After 1980 they get a little larger.
But these aren’t really the major issues .. đ