I need to find the KitItemRecID on each kit item in the cart on shoppingcart.cs. I'm already looping through each product successfully but I need to grab the ExtensionData from each KitItem. How would you suggest doing this on shoppingcart.cs.

I don't have the source code and am aware of the potential maintenance nightmare related to modifying this page.

What I'm doing is adding a dollar amount to each product if shipping to Canada. Then, in turn, I need to add a dollar amount to each kit item as well if shipping to Canada.