I believe the seats from any RBV up to 91 are direct bolt in, after that you will need to retain your seat rails. I have been upgrading the interior of my 86 B2. It is now gray, (that was not offered until the 89 model year I believe, got tired of the Canyon Red). The high back bucket seats are from an Explorer of the mid 90's vintage, the seat rails are from a 91 Explorer Sport, these were direct bolt in. The seat pads, and back pads, actually came from three different Explorers. If any one is interested I can make a "How To" on putting this together.

Ray