i hope this helps
yes it will fit you rb26.as for benifits the n1 has higher pressure than a oem and oem have 12 gears and 81mm and the n1 have 1 less gear and is 77mm
so a bit better than oem
This picture should explain it all... Top is the stock pump, bottom is the N1 pump. Notice the larger volume of the cavities created by the drive gears on the N1 pump (high volume) & the extra bolt hole. Also, the drive gears on the N1 pump are made of much harder steel. That whole bull**** about the two pumps being the same but with different springs is completely WRONG.