There are 7 body screws to be removed that attach the front bumper to the frame of the car. The first 5 screws are all on the same eye level as the underskirt of the car whereas screws 6 & 7 are above the passenger and driver side tires.

It is very common for body screws to have been replaced, especially on older cars. When replaced, bolts will always have the same size diameter, but the size of the bolt head may very.