The opening of each slotted jack pad is 0.378", depth is 0.642", wide by 2.992" in length.
2pcs-Slotted Blue Universal Magnetic Jack Pad Pinch Weld Frame Rail Adapter
2pcs-Slotted Blue Universal Magnetic Jack Pad Pinch Weld Rail Adapter
Premium Slotted Universal Magnetic Jack Pad Pinch Weld Frame Rail Adapter Blue
Blue Premium Slotted Universal Magnetic Jack Pad Pinch Weld Frame Rail Adapter