These universal engine mounts are designed for use on all types of 4WD and 2WD vehicles that have frame rail widths up to 30". The frame brackets can be used in either the upward or downward position for the best engine location. The bracket can be either welded or bolted into position. If you are dealing with a vehicle that has an open channel, then you should box-in the frame rail prior to mounting the new bracket. If your frame rail is wider than 30 inches.