So I happened across a complete, and I mean complete CTIS system for an A3. How difficult would it be to install it on an A2 or would it be worth the effort? It was meticulously removed from an A3 that is going into wildland fire service. I have everything all the way down to the wheel bearings. only one wire had to be cut off the vehicle harness. Will I need all A3 backing plates and hubs? Those are the only parts I do not have.