Do I need to buy both hinges or just one?

Each hinge is sold individually. If you're replacing a worn hinge on one side, one unit is all you need. For a full hood refresh or if both hinges are damaged, order two — one for each side.

Will this work with my factory hood latch and catch?

Yes. This hinge is designed to work with the factory hood latch assembly on 2010–2018 Ram 2500/3500 trucks. No modifications to the latch or catch are required.

Does this hinge come with bolts?

Hardware is not included. You'll reuse the existing fasteners from your old hinge or source new bolts to match the factory spec. Refer to your truck's service manual for torque specs if installing fresh hardware.