It's the radiator hose support and standoff. Front left side of the motor.
look in the upper left of the picture, see the metal ring? that's the puppy it attaches to that bolt just to the right.
larger size pic is
HERE
OR
it's the guide for the fuel tank vent and overflow hoses.
.
look on the lower left of the pic right under the oil window. Larger pic
HERE
they are basically the same part, but one has a larger diameter ring