This is a dome light, part number 823 947 105B, fits 76-92 Type 2 Bus or Vanagon models.

It fits 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991 and 1992 models.