RB25DET have 2 types of injectors, one for the Neo, one for R33 RB25det. Neo is top feed, and also a one off size. Nismo make a 480cc for the neo. Sard do one that will fit with a bit of modding to the rail.
For r33 ones, they are side feed and you have to buy collars and get the long ones if you choose Sard.