Replacing this front locking axle nut when you replace your rotor or wheel bearings is cheap insurance.  This nut is peened with a hammer and small punch during installation.  Repeated re-use of old nut weakens its shoulder, causing it to potentially loosen down the road.  

Fits 2WD vans 1980-1991.

One per side, two per van.

Ref ID: 251407671