Mirroring GUITexture While Preserving Rect.Contains()

Hello.

In working on an application, I have hit an unexpected snare. For part of my app's interactions with the user, I need to be displaying a GUITexture on the screen. I check for interactions within the rectangle (both GetScreenRect() and pixelInset) via Contains(Vector2).

However, in order to mirror this GUITexture across the y-axis, I set the width on pixelInset to a negative value and offset the x accordingly. The display works perfectly, but now rect.Contains(Vector2) no longer works.

Is it possible to achieve the effect or mirroring across any axis with a GUITexture while maintaining rect.Contains(Vector2) functionality?

If not, I am not opposed to doing the math. Just curious on if Unity has any integrated way of producing this effect without overhauling an older library I made.

Thank you!