They have a similar design across manufacturers with a metal cup and a single through bolt. These came from the front of my old 1999 Jeep Grand Cherokee ZJ project. The Sport Trac is an axle over the leaf spring configuration from the factory. I replaced the axle with a Sterling 10.5 from F250 and went spring under. This moved the bump stop contact surface further away, requiring a longer bump stop. I had these lying around and fit the bill perfectly. They are the same for the XJ and TJ as well. Ebay is probably a great inexpensive resource.