Shift Assist Question

[torqmonster]

I am trying to size up a thrust bearing at our local parts store. Should the bearing be the same size as the plastic thrust washer it replaces, which is tight to the steel shaft, or should the inside diamater be a little bigger so it can slide over the white plastic spacer?

 

[BigRed118]

The shift assist is a little different. The new version sits in a delrin cup/washer. They are only $19.95 from D&D