Aluminum sliding ladder can be used on any RTT model. The ladder is 78″ tall but you can also purchase the extension to add an additional 18″. You may need to re-drill the holes for the bracket mounts to set them for the correct width.
If you are trying to mount your RTT to factory bars or Aero-style bars that are too thick, these longer mounting plates are the trick! They measure 4.25″ center to center. They are made from stainless steel. They use the same nuts and bolts as your original plates.