I have a 98 with the same problem, first you need to make sure your hard top is situated well, after that you need to go to the hardware store pick up some lag bolts, I think I got 3/8s make sure there threaded all the way to the top. Pull all the pins in your lower doors; most of the time there broken. Go to the area in home depot or Lowes that has furniture hardware, there you should find a piece designed for holding casters it’s a small rind with 3/8ths threading going down throw the middle of it you will need 6 of these. After getting that go get some self tapping steel screws and some metal strips about 1 inch wide by 12 inches long they can be found in the roofing area. Make a hole in the metal strips large enough for the furniture piece to go through. I super glued it to the top so it wouldn’t move the furniture piece should have a lip on the top with tiny hole for finishing nails. After making my bracket I cut off the extra metal so I had a 3 by 1 rectangle with my hole in the middle. After making 6 of those take your inner door panels off and mount all 6 of your new mounts to the top of your doors, screw them in ,replace the panels, cut the lag bolts down about 2 inches, get some washers and put your top back on using the new lag bolts. The whole thing should cost less than 20 bucks and your doors will not move any more.