Spawn Shield to all objects

Hi all, I have 3 objects in my game (that move around randomly). What I am trying to do is when you buy the shield upgrade in the shop it adds a shield to each one.

My script so far adds the shields at each objects current position when you buy it in the shop but then the shields just stay where they instantiated not stayed attached to the objects, can anyone help to make each shield object then follow the object it spawned on?

 private var ray : Ray;
 private var rayCastHit : RaycastHit;
 var buySound : AudioClip;
 var buy_effect : GameObject;        //buy effect
 var tick : GameObject;
 var locked : GameObject;
 var plus2 : GameObject;
 var player : GameObject;        //The player
 public var respawnPrefab: GameObject;
 public var respawns: GameObject[];
 
 function Start(){
 
         //Find jiji_standard
         //jiji = GameObject.Find("jiji_standard");
         
         //Find jiji_standard 1
         //jiji1 = GameObject.Find("jiji_standard 1");
 
         //Find jiji_standard 2
         //jiji2 = GameObject.Find("jiji_standard 2");
 
         //Find player
         player = GameObject.Find("Player");
         
         tick.active = false;
 }
 
 
 function Update(){
 
 if(Input.GetMouseButtonDown(0)){
 
 ray = Camera.main.ScreenPointToRay (Input.mousePosition);
 
 if (Physics.Raycast (ray, rayCastHit)){
 
 if(rayCastHit.transform.name == "shield" && locked.active == false){
 
 //crate buy effect at point of hit
 buy_effect.active = true;
 
 audio.PlayOneShot(buySound);
 
 tick.active = true;
 
 player.GetComponent(Game5_Player).Addmana(-80);
 
 plus2.collider.enabled = false; 
     
         respawns = GameObject.FindGameObjectsWithTag("jiji_standard");
     for (var respawn: GameObject in respawns) {
 
         Instantiate(respawnPrefab, respawn.transform.position, respawn.transform.rotation);
         
 
 }
 }
 }
 }
 }