You'd better change the whole glass. I live in TORONTO and had ever met the same situation with you. The technition of my garage suguest me to change the whole glass, they told me, one of their customer did not change the whole galss, it was in winter, outside is very cold, but inside is warm, then the glass was totaly broken, the car owner can not drive and had to call a toll truck to toll his car to the garage to fix it. You see it will cost more! It cost me $220 to change the whole glass.