Answer:

sunroof

Answer	Crossword Clue
SUNROOF	"Tilt and slide" auto option
SUNROOF	Venting car option
SUNROOF	Auto extra

SUNROOF	Feature of some cars
SUNROOF	Auto option
SUNROOF	Option not available in a convertible
SUNROOF	Car option that slides open
SUNROOF	Slidable car part
SUNROOF	Convertible alternative