I used my wife's hand cream to apply to the small ball on the bottom of the antennas on my 2001 convertible. . I had to push a little, clamp it with a wrench and push down slowly, but it slid down and firmly entered the hole in the wing for the antennas. The seal around the wing worked. Feel the inside of the wing, there are no gaps. This is a tight fit. (I have no idea where the original part went - potholes in New Jersey are pretty annoying - but I'm really glad someone thought of making a replacement.)