The opening of each slotted jack pad is 0.378", depth is 0.642", wide by 2.992" in length.
High Strength Slotted Magnetic Jack Pad Pinch Weld Frame Rail Adapter Orange
Red High Strength Slotted Magnetic Jack Pad Pinch Weld Rail Adapter
Red High Strength Slotted Magnetic Jack Pad Pinch Weld Frame Rail Adapter