Although this is a quite simple part, personally I wanted the surface below the retainer, in the contact point between the retainer and the strings to be smooth and have the proper curvature. With the original Fender's I had an issue, while bending I was hearing a ''ping'' and it was not from the nut. Two things that play role is what I mentioned above and the height of the string tree from the headstock. This set provides two spacers. With the 5mm spacer, I hear no noise anymore. So problem solved! I recommend this set but first try to understand why you need a new string tree.