Do these mount to factory bolt holes or do I need to drill?

They bolt directly to factory mounting points — no drilling. Line them up, insert bolts, tighten, and you're done.

Will the chrome finish hold up to salt and winter conditions?

Chrome is corrosion-resistant, but it'll eventually show water spots and oxidation if left untreated. Regular rinses with fresh water and occasional wax keep it looking sharp longer.

What hardware do I need to install these?

Bolts and fasteners are not confirmed in the package — verify your truck's factory mounting bolt size and length before ordering hardware separately or contact support for a parts list.