Will these headers fit my original exhaust manifold bolt holes?

Yes — these mount at factory rocker points. No drilling or frame modifications needed. Test-fit before final installation to confirm clearance with your specific engine bay setup.

Do I need to wire-brush or treat the stainless before bolting them on?

No prep required. Stainless arrives ready to install. If you want to polish them for appearance, that's your call — but it's not necessary for function or durability.

What fasteners do I need to secure these?

Header bolts are not included. Use stainless or high-temp hardware rated for exhaust temperatures. Your vehicle's service manual will specify the correct size and torque spec for your engine.