It should screw into the carburetor on the feed line.
If the Bonneville is like my GTP then the fuel filter is in front of the fuel tank
the owners manual states that replacement of the fuel filter is not required.
in front of the left rear tire
If the car has the original Rochester carb on it, the filter is inside it. Follow the fuel line to the carb. There you will see what looks like a large hex nut. Loosen that and inside there is the filter available at any auto parts store.
Look along the frame rail or in front of fuel tank--follow fuel lines
the fuel filter is on the passengers side of the car by the right front wheel behind the bottom of the motor
passenger side rear backseat area under car
fuel filter is located in front on right rear wheel mounted to the frame. bleed fuel pressure before changing it
fuel filter is located in front on right rear wheel mounted to the frame. bleed fuel pressure before changing it
Probably along the frame rail under vehicle -- follow fuel line from tank
behind the driver, under the vehicle.
look under vehicle along frame, follow line from fuel tank