1972 Duster Build with my Daughter

Looks like the long bolt for the engine mounts in the block. The rest are short bolts.
It is too big in diameter. The engine mounts are already installed. This seems more like a bolt for the steering knuckles to lower ball joint but there is only one and I already have all that installed.... This is the problem of having 2 cars to build one, a simple mistake in bagging and make you go crazy trying to figure out what car it came from and did you forget something on the one your building!