Do these bolt directly to the truck without drilling?

Yes. These mount at factory rocker attachment points — no drilling or frame modification needed. Use the existing holes for a clean, stock-looking install.

Will the black finish hold up to salt and road spray?

Black hard panel holds up well under normal conditions. For maximum durability in harsh climates, rinse regularly and consider a protective wax coating to slow oxidation.

Do I need fasteners or hardware beyond what's at the factory mounting points?

Hardware is not specified in the product data. Confirm your truck's factory attachment hardware before install — you may need OEM bolts or Grade 8 fasteners depending on what's already at the rocker.