If you're racing in either a Prepared or FX Class, you need to ditch the front end that has the funky plastic bearings altogether, or you won't run competitively, no matter what kind of bearings you replace them with. The factory front end lacks all of the necessary steering Geometry and Adjustments to run competitively.
See the MVM Fast Front End at
G-Team Racing or drop George a line and inquire about the Front End EC Distributing offers.