From what I can make out on one or more of them they simply covered the bottom mount hole with a piece of colour matched tape of some kind. The bottom mount on the originals is just aft of what would be the front landing gear doors.
Just looking at that b&w shot above I looks like the top and bottom mount points line up. You can actually see the tape on the bottom in that shot.
Just looking at that b&w shot above I looks like the top and bottom mount points line up. You can actually see the tape on the bottom in that shot.