New stub axle bolt for R160 and R180 differentials. Two different lenghts of bolts depending on which style of axle you have. If you hvae a 4-bolt flange axle the PT# 800-299 is the correct bolt. If you have a complete axle assembly without the 4-bolts you will need PT# 200-723. The OEM Nissan bolt (200-723) has an under head length of 112mm. The aftermarket bolt (800-299) has an under head length of 100mm. See pictures for more details.