I have had issues getting inserts to match up with factory blade and i messed up and bought new blades to fix issue. BIG mistake, you can buy a whole new blade at walmart made by michelin for the price of the inserts alone!! michelin blades are iam sure made by pylon which has been making blades since before i was born! If ya are trying to find matching inserts for factory blades i would make sure and take blade with ya when ya go and save the back and forth as i did!!