I agree with Trakyan; those bronze bushings are meant for shafts to spin in, not for sliding along shafts.
Type: Posts; User: awerby
I agree with Trakyan; those bronze bushings are meant for shafts to spin in, not for sliding along shafts.
You're going to have to take it apart anyway to replace the bearings, so wait until you do that before ordering the new ones. A different length won't matter much, as Traykan says, but a different OD...
Does this large CNC router really run entirely on unsupported shafts? That's not recommended over long spans. Do you have a way to press out the old bushings and press in new ones? If it were me...