35-37 back of cab bracing help needed

[Vanspeed]

Does anybody have a really nice cab that has had no damage to the vertical braces that go from the window opening to the floor? I had to remove them to repair the bottoms and actually took one from another cab that was in better shape. Are these flat or is there a slight curve in them? I see at the bottom there is a little curve but one from there up is flat and the other is slightly curved. Which one is correct? Any help appreciated.