secondary air injection tube on 2000 GMC Sierra 2500

i recently acquired this truck from my dad. now that i have it i noticed that it was idling rough so i cleaned the throttle body, when i was inspecting the engine compartment i noticed that the secondary air injection pipe was deformed. upon further inspection it seems that is was to close to the exhaust and became warped from the heat restricting air flow. where do i find this part

Asked by for the 2000 GMC Sierra 2500
Try a used parts source, or the dealership.