That is a "sandwich" governor, so-called because it is sandwiched between the carburetor and the intake manifold.
A couple of the more common brands were Huff, and Handy. I think (not sure) yours is a Handy.
Cannot help with the fitting.
Jon
Good carburetion is fuelish hot air The most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes! The Carburetor Shop
