Plymouth offered nearly 30 different colors in 1970, so assuming that each color was ordered about as frequently as the others (which is probably not very true -- primary colors like blue and white were probably more popular), then there might be only 60 to 70 Fury III convertibles in 'lemon twist yellow' if the total production was only 1,952. I'd say that's rare. Plus many of those ended up getting crushed or parted out.