Vehicle Fitment Compatible with Jeep AMC Model 20 JGhyperX offers cast aluminum differential covers for most case design applications. They feature thick gasket rails to resist oil leaks, as well as cast-in ribs for added strength and heat dissipation. Some models include a drain plug and/or filler plug. Choose from Natural Aluminum with machined rib edges, Black Powdercoated with machined rib edges or Highly Polished finishes. These differential covers include a gasket and mounting bolts for a complete installation.