The rear seat belts in your 88 mount different than the 87. In the 88 the retractor mounts on the inside of the rear panel. The belt marked "center" mounts to the outer holes on the floor. The belt buckles that attach to the retrators mount to the 2 inner holes on the floor just like S/M's pic's.
![My Two Cents :twocents:](https://board.marlincrawler.com/Smileys/marlin/twocents.gif)