I am thinking that they are like the F-250 lids. There is likely a retaining ring around the outside edge of the lid. You will need to take it apart so that you can see it. Once the bottom plate is off, you will see a ring around the outer edge that looks like an Oring. You slowly work that out of the groove, and you will see there are little teeth that are holding the Vinyl in place. At that point, you can pull off the vinyl, or leave it in place. You can put down a thin layer of foam, available at an Automotive fabric store. Most large cities have them, then work the leather into the groove and work the ring back in until each of the teeth click. Trim the leather, reassemble the lid, and it is all done.
If they are like the F250 lids, it is not super difficult to do. If it isn't, well, good luck.
