Do I need new bolts or fasteners to install this?

Your original fasteners will reuse the factory mounting points — confirm they're in good condition before installation. If any bolts are stripped or corroded, source replacements before you start.

Is this assembly packed with grease or do I need to prep it before installation?

This is a sealed unit ready to install straight from the box. No additional greasing, packing, or prep required.

What if the assembly doesn't seat flush against the mounting surface?

Test-fit first without final torque. If gaps appear, inspect the old hub for corrosion or damage on the mating surface and clean it thoroughly. Debris or rust will prevent proper seating and bearing preload.