gui texture crop and resize

hi i use guitexture and i want crop that but i want that be good for any resolution and my gui resizer script is this: (1) and my crop script is this : (2) how can i combine this two wich my gui texture resize to any size and crop every update (like health bar) ..... scripts : (1) :

 public class GUITextureResizer : MonoBehaviour 
 {
     private GUITexture _guiTextureRef;
     public const float BASE_WIDTH = 800;
     public const float BASE_HEIGHT = 600;
     private float _baseHeightInverted;
     private float _originalPixelInsetWidth;
     private float _originalPixelInsetHeight;
     
     void Awake()
     {
         _guiTextureRef = GetComponent<GUITexture>();
     }
     
     void Start() 
     {
         _baseHeightInverted = 1/BASE_HEIGHT;
         
         _originalPixelInsetWidth = _guiTextureRef.pixelInset.width;
         
         _originalPixelInsetHeight = _guiTextureRef.pixelInset.height;
     }
     
     void FixedUpdate()
     {   
         float ratio = Screen.height * _baseHeightInverted;
 
         _guiTextureRef.pixelInset = new Rect(0, 0, _originalPixelInsetWidth * ratio, _originalPixelInsetHeight * ratio);
     }
 
 }

............... script (2) :

 public class GUITexturecrop : MonoBehaviour {
 
     
     private GameObject tire;
     private GUITexture texture;
     //public Rect textureCrop = new Rect( 0f, 0f, 0f, 0f );
     private float textureCrop_x = 0f;
     private float textureCrop_y = 0f;
     private float textureCrop_width = 0f;
     private float textureCrop_height = 1f;
     
     public Vector2 position = new Vector2( 0, 0 );
     
     // Use this for initialization
     void Start () {
         texture = gameObject.GetComponent<GUITexture>();
         
     }
     
     // Update is called once per frame
     void Update()
     {
         textureCrop_width = /// my change ///  ;
     }
     
     
     
     void OnGUI () {
         GUI.BeginGroup( new Rect( position.x, position.y, texture.pixelInset.width * textureCrop_width, texture.pixelInset.height * textureCrop_height ) );
         GUI.DrawTexture( new Rect( -texture.pixelInset.width * textureCrop_x, -texture.pixelInset.height * textureCrop_y, texture.pixelInset.width, texture.pixelInset.height ), texture.texture );
         GUI.EndGroup();
         
     }