lay the glass down on a bench arch of glass facing up. If you have a yard stick , lay it across the glass from top of glass to bottom of glass. With the yard stick there or just use a straight edge , measure from the center of the glass to the bottom of the yard stick and see how deep you arch in glass is. This will only confirm you where correct on the glass being to flat or not. if you don't have the original glass to compare it to I have mine and can give you the measurement on what it should be!

I just ordered my glass from ecs a few days ago!