The bumper I don't know the number of, maybe Jason can put some light on that.
The standoff kit doesn't come with longer screws. It works different than the original part. First you screw a set screw into the pivot balls, on that you screw the standoff which is threaded inside (it now has a hexagonal top so you can use a wrench) and then you place the upper arm brace and mount it with two short screws. All the hardware you need is supplied with it.
Just take off the old and mount the new and you are ready to go!!