Passing an instance of a class to different game objects

I am trying to make a product catalog so we can show products, take orders, etc when on different devices and offline to our store.

At the moment I am having trouble passing a instantiated class to another gameobject. I checked some of the similar questions but they did not help me (or I couldn't get them to work with my situation) The way I have it set up is all through UI elements.

First I have the Product Class that holds all the information for a product:

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine.UI;
 
 public class Product : MonoBehaviour {
 
     public string productName;
     public Image productImage;
     public string productSKU;
     public float productPrice;
     public List<string> categories;
 }

Then I have a product master where I create all the products:

 public class ProductMaster : MonoBehaviour {
 
     public static ProductMaster instance;
     public List<Product> product;              //List to hold all product data
     // Use this for initialization
     void Awake(){instance = this;}
 
     void Start () {
         AddProducts ();
     }
     
     void AddProducts()
     {
         Product Item1 = new Product ();
         Item1.productName = "A Ball";
         Item1.productSKU = "BALL";
         Item1.productPrice = 39.99f;
         Item1.productDescription = "Details1,\n followed by details 2";
         Item1.productImage = (Image)AssetDatabase.LoadAssetAtPath("Assets/Images/item-1.jpg", typeof(Image));
         product.Add (Item1);
 
         Product Item2 = new Product ();
         Item2.productName = "Another Ball";
         Item2.productSKU = "BALL2";
         Item2.productPrice = 19.99f;
         Item2.productDescription = "Details1,\n followed by details 2";
         Item2.productImage = (Image)AssetDatabase.LoadAssetAtPath("Assets/Images/item-2.jpg", typeof(Image));
         product.Add (Item2);
 
     }
 }

And so on for all the products. This all works fine and gets the data into the list.

The next step is that I need to instantiate all the products of a certain category into thumbnails on a canvas. I do this with the following:

 public class CategoryProducts : MonoBehaviour {

 ProductMaster PM;
 public GameObject productThumbnail;
 public Canvas viewPort;
 // Use this for initialization
 void Start () {
     PM = ProductMaster.instance;    
 }
 
 // Update is called once per frame
 void Update () {
     if (Input.GetKeyDown ("c"))
         FillCategory ("Balls");
 }

 void FillCategory(string category)
 {
     foreach (Product p in PM.product) {
         GameObject go = Instantiate (productThumbnail) as GameObject; //productThumbnail has a Product Script on it
         go.name = p.productName;
         go.transform.SetParent (viewPort.transform, false);
         go.GetComponent<Product>() = p; //THIS IS THE PART THAT DOES NOT WORK. HOW CAN I ASSIGN THE DATA FROM p INTO THE PRODUCT ON THE productThumbnail?
         Debug.Log (p.productSKU + " " + p.productName);
     }
 }

}

The instantiated gameobject from the above code has a product class attached to it that I want to assign the data from the PM.product List but it spits out the error:

The left-hand side of an assignment must be a variable, a property or an indexer

The instantiated object is also a button that when the user presses it, it passes the product data again into a canvas that displays all the information such as productName, productPrice, etc.

How do you pass an instance of a class full of data to another gameobject? Or is there another way I should be tackling this issue? I think the best way is for all the parts of the program (there will be 3 canvasses where the same product info need to go to) to reference the one master product list rather than recreating the product in each instance.

Cheers