This step installs very easily by slipping into the 2 jack holes. The only time we have had any problems with the step fitting properly is when 1 or both jack points have been damaged or bent. Also, if the jack points have been replaced in a restoration with aftermarket joint mounts. We have found that some of the replacement jack mounts are slightly miss shaped NOT SQUARE. This can easily be corrected by reshaping the hole with a file or body hammer. You should check the condition of your jack points before ordering. You will need to drill a hole in each jack mount to secure the step from sliding out.