How do you keep your seat belt buckle from falling through the seat?

[kolle_hond]

Hi, I'm not sure if anyone else has this issue, but with my 3-point seat belts, I have always had the issue of the buckle falling back through the bench seat, onto the floor.
So currently I have them held on the seat with some wire, going across the seat and hooked to the bottom (which is obviously a real eyesore). I have found that the issue usually occurs as soon as you sit down, the weight on the bottom part of the seat causes the gap to widen and the buckle easily falls through.
Any suggestions/ideas will be appreciated.