S:5,W:4. S:5,W:4. Belt that secures an Occupant to the Seat. S:5 OBK:4. S:5 W:4. S:7 OBK:6. Seat Belt Lap and Shoulder Belt. A Threaded Rod with a Drive Head (such as Hex. 12 Point. torx. etc) on One End used to secure the Seat Belt Shoulder Belt to its Mounting Point.