front bumper help

you'd have to go into a lil more detail on how it doesnt fit...being that it is aftermarket they never fit exactly...i bought a 03 cobra bumper for mine, it wasnt ford made, so it didnt fit, i had to use the old brakets off my old bumper....but after i put it on and lined it up and tightened it tight, it fit...i had to drill new holes where the two peices that go on either side of the grill go up into the hood, well i had to drill two new holes in that in order for them to line up with the stock ones...if its fiberglass, u can always sand down parts...just give some more detail, maybe i can help a lil more