This is a genuine OEM Subaru nut for the front CV joint. It's a direct replacement if you've stripped or lost one. Supersession numbers are 902170044 and 902170047. Sold individually. Note that Subaru of America only warranties parts installed on a car with a matching VIN.
Using this Subaru front CV axle nut is easy. Just remove the old, stripped, or misplaced nut and replace it with this one. Make sure to tighten it properly. When it comes to maintenance, check the nut regularly for any signs of loosening. If you notice any issues, tighten it up right away. Remember, Subaru of America will only warranty this part if it's installed on a car with a matching VIN, so keep that in mind when using it.
