Do these require any fasteners or hardware to install?

Hardware is not included with these flares. You'll need to source bolts and clips that fit your vehicle's factory mounting points. Test-fit before committing to fastener type and size.

Can I paint these, or do they come ready to install?

These ship as bare hard panels. If you want them color-matched to your truck, light sanding and primer application before painting will give you the best results. Unpainted finish is also popular for a factory look on black trucks.

What tire and wheel sizes do these work with?

They're designed to clear larger aftermarket setups, but clearance depends on your specific offset and backspacing. Test-fit with your wheels before final installation to confirm no rubbing at full lock.