Do these arms work with coilovers or only leaf spring lifts?

These control arms are designed for the lift range specified and work with both coilover and spring-based lift systems. Your specific shock and spring choice will determine ride quality, but the arms themselves mount at factory points.

Will I need to get an alignment after installation?

Yes. Any suspension modification changes your truck's geometry. Get a full 4-wheel alignment at a suspension shop after install to ensure your truck tracks straight and tires wear evenly.

What hardware do I need to bolt these on?

The arms mount at factory attachment points. You'll reuse your existing bolts and fasteners. Refer to your vehicle's service manual for torque specs—don't overtighten.