DESIGN CHANGE WARNING:
13N-45: The O.D. (8mm) of the sleeve of the pinion that fits inside the bearing is a larger diameter than the original part, as is the I.D. of the 26N-40 bearing. The newer pinion WILL NOT FIT in the older bearing. The older pinion will be loose inside the newer bearing. Measure O.D. of your pinion gear's sleeve to determine what set of pinon/bearing that you have.
See Design Change 45GLS Pinion/Bearing for more details.