Where does this go?

B&S 7.25HP on a Toro 22in walk behind: Last week I noticed this piece hanging down (pic 1). Today, I had some maintenance to do and took the air filter housing off the carb and noticed pic 2. My gut tells me either pic 3 or pic 4 is correct, regarding the placement of that plastic arm, but I'm not sure. Would love some advice before I put it back together.