Unity 5 2D - How to scale a quad to fit all screen resolutions?

Hi. So I'm trying to have a nice parallax effect in a 2D game I'm trying to make but I'm having trouble getting my sprites to scale to all resolutions.

Here's the script that I have attached to my background sprites:

 using UnityEngine;
 using System.Collections;
 
 public class BackgroundScaler : MonoBehaviour {
 
     public int textureSize = 194;
 
     void Start () {
 
         var width = Mathf.Ceil (Screen.width / (textureSize / CameraScaler.scale));
         var height = Mathf.Ceil (Screen.height / (textureSize / CameraScaler.scale));
 
 
         if (gameObject.name == "Bg1") {
             transform.localScale = new Vector3 (width * textureSize, 40f, 1);
         
         } else if (gameObject.name == "Bg2") {
             transform.localScale = new Vector3 (width * textureSize, 40f, 1);
 
         } else if (gameObject.name == "Bg3") {
             transform.localScale = new Vector3 (width * textureSize, 100f, 1);
 
         } else if (gameObject.name == "Grass") {
             transform.localScale = new Vector3 (width * textureSize, 20f, 1);
 
         } else if (gameObject.name == "Ground") {
             transform.localScale = new Vector3 (width * textureSize, 70f, 1);
             
         } else {
             transform.localScale = new Vector3 (width * textureSize, height * textureSize, 1);
         }
 
 
         GetComponent<Renderer> ().material.mainTextureScale = new Vector3 (width, height, 1);
 
 
     }
 }
 

And here's the script I have attached to the main camera:

 using UnityEngine;
 using System.Collections;
 
 public class CameraScaler : MonoBehaviour {
 
 
     public static float pixelToUnits = 1f;
     public static float scale = 1f;
 
     public Vector2 nativeResolution = new Vector2(800,480);
 
     void Awake() {
 
         scale = Screen.height / nativeResolution.y;
         pixelToUnits *= scale;
         Camera.main.orthographicSize = (Screen.height / 2.0f) / pixelToUnits;
 
     }
     
 }
 

Can someone please help me out? Thanks!