BUDDY BODYKIT INSTALLATION

I BOUGHT A BUDDY REAR BUMPER OFF OF EBAY FOR MY 97 HONDA ACCORD AND WHEN I INSTALLED IT THE SIDE OF THE REAR BUMPER BOWS OUT. HOW DO I GET THE FIBERGLASS TO STAY NEXT TO THE BODY OF MY CAR, I TRYED SCREWS AND THEY DIDNT WORK EITHER, SOMEBODY PLEASE HELP. 

I moved you over here where you might get an answer from someone, sorry that I can't help you my self..
 
                           WheelBrokerAng