Ideal for 2005 Toyota Prius. Fel-Pro makes quality parts and the price of this o-ring is very reasonable. It runs between the exhaust manifold and the catalytic converter. Tip: The spring bolt is likely to rust badly. Light the nut with a flashlight to loosen the spring bolt, touch the hot threads with chalk or other wax to get it between the nut and bolt, then unscrew the bolt while it's still hot. Should be easy to disassemble with hand tools.