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