I went to replace the bulb in the trunk light socket and was met by something I had never seen before: the socket appears to be made in two thicknesses. First a wide one with appropriate cut outs on the side where the bulb nipples fit in, then a long slender shaft (with a cardboard tubular insert) down to the positive contact. I've never seen anything like this. Only thing I can figure is that it is designed to have a metal rod inside the cardboard shaft that allows the contact to touch the bulb that is locked in up top. However, the book says this is a #89 bulb (which is very small) and would not fit this setup.