Who and where should i buy a new top for a 69 barracuda

I have in the box a brand new white back glass window
Is the bottom of the glass curved or straight. An old-timer told me to watch that on replacement tops.

oops - Might be different on Barracuda Vs Dart. But on the Dart the top material that is attached to the bottom of the of the glass follows the line of the trunk valance.