DO NOT DRILL A HOLE!!!!!
i have a focus sport upper front stress bar and it definatly is a tight fit!
i had to work with it and use a rubber mallet to get it on but it is ment to be a tight fit or it would be less usefull than it currently is...(sorry, but i have both front and rear stress bars and it makes absolutly no cornering differences imo)
get a *strong* <important> friend to help you out...work with it for a while i think you have to pry hard enough to slightly flex the bar but im not sure if thats what happened or i just got lucky...but i promise youll be pissed if you drill...i know its tight but bare with it...you can do it...
it looks good with it on....check it out!