GUITexture scaling with aspect ratio?

Hello good people of unity! I'm currently doing GUITexture. What I want to do is to make the texture scale according to the aspect ratio (if that makes sense)? What I mean is that if I have a GUITexture (that acts as button) is of size dimension 232 x 106 pixels in a 1920 x 1080 (16:9) screen by default, i want the texture to be smaller size in a smaller screen/resolution (lets say a screen of 1024 x 768 (4:3)) BUT I don't want that texture to be squashed.

Because previously my GUI were created by using ONGUI() and it was squashed when i switched to a smaller resolution. Eg.

 void ResizeGUIMatrix()
     {
         // http://answers.unity3d.com/questions/359320/relate-font-size-to-screen-size-in-guiskin.html
         // Set matrix
         Vector2 ratio = new Vector2(Screen.width/defaultScreenRes.x , Screen.height/defaultScreenRes.y );
         Matrix4x4 guiMatrix = Matrix4x4.identity;
         guiMatrix.SetTRS(new Vector3(1, 1, 1), Quaternion.identity, new Vector3(ratio.x, ratio.y, 1));
         GUI.matrix = guiMatrix;
     }
 
     void OnGUI()
     {
         // Resize GUI Matrix according to screen size
         ResizeGUIMatrix();
         
         DrawButtons();
         
         // Reset matrix after finish
         GUI.matrix = Matrix4x4.identity;
     }

My research led me to [this][1].

And I tried all sorts of different things such as:

 void Update () 
     {
         if (currentScr.y != Screen.height)
         {
             self.pixelInset = new Rect(
     //            (self.pixelInset.x / defaultScreenRes.x) * Screen.currentResolution.width,
     //            ((Screen.height - self.pixelInset.y) / defaultScreenRes.y) * Screen.currentResolution.height,
                 self.pixelInset.x,
                 self.pixelInset.y,
                 Mathf.RoundToInt( self.pixelInset.width * (float)(currentScr.y / Screen.height)),
                 Mathf.RoundToInt( self.pixelInset.height * (float)(currentScr.y / Screen.height)) );
             
             Debug.Log("Result: "+((float)(currentScr.y / Screen.height)));
             
             currentScr.Set(Screen.width, Screen.height);
         }
  }

But it still doesnt work. Can anyone help me out here? All help will be much appreciated thanks! :) [1]: http://answers.unity3d.com/questions/61213/build-is-changing-gui-positions.html