Unity 5 Mouse Look Problem

So what I try to do is to make a script which will check whether the mouse is over an object, then it will check if it is a rigidbody and if the user presses "R" and if so it will disable the mouse look sensitivity x and y and will rotate the object with mouse movement.

The problem is that Unity keeps giving me these error: 'XSensitivity' is not a member of 'UnityEngine.Component' 'YSensitivity' is not a member of 'UnityEngine.Component'

Here's the script:

 #pragma strict
 
 var speed : float = 1.0;
 var player : GameObject;
 
 function Start () {
 
 }
 
 function Update () {
     var ray : Ray = Camera.main.ScreenPointToRay(Input.mousePosition);
     var hit : RaycastHit;
     if(Physics.Raycast(ray, hit)) {
         if(hit.collider.gameObject.GetComponent("Rigidbody") == null) {
             if(Input.GetKeyDown(KeyCode.R)) {
                 player.GetComponent("Mouse Look").XSensitivity = 0;
                 player.GetComponent("Mouse Look").YSensitivity = 0;
                 hit.collider.gameObject.transform.Rotate(Vector3(Input.GetAxis("Mouse Y"), Input.GetAxis("Mouse X"), 0) * Time.deltaTime * speed);
             } else {
                 player.GetComponent("Mouse Look").XSensitivity = 5.5;
                 player.GetComponent("Mouse Look").XSensitivity = 5.5;
             }
         }
     }
 }

What's the problem? Thanks!