Do these covers work with the factory door lock cylinder?

Yes — the keyhole is cut through, so your existing lock mechanism stays in place and functional. No rewiring or lock swap needed.

What prep is needed before installation?

Clean the handle surface with soap and water, then dry completely. Any dust or residue will prevent a solid fit, so wipe them down before you bolt these on.

Will these covers fit over chrome or painted handles?

They're designed to cover factory handles as they sit. If your handles have heavy chrome plating or custom paint, test-fit first — covers rely on a solid surface to clamp down properly.