When I did oil change today, I found those two parts on the plastic board. This is 2010 Prius II with 180k miles. Please share if you have any idea.
I believe that those are from the exhaust pipe to the manifold. Has the engine been changed? Or the exhaust? There are 2 springs with the bolts that hold the exhaust pipe to the manifold, with the gasket in between...
I was going to say if your cat's not missing you said it's been changed those parts got caught up under the plastic fell out when you changed the oil