Curtis;Tried ebay as well as google to no avail. It’s not a typical part as it has a drawbar and frame for a coupler attached to it.
Cab1;I think Traction Fan nailed it. I didn't even know Kadee makes trucks too. If that route doesn't work out the only thing left to do would be to hunt around ebay for a busted up "parts" loco of the same make and model you have.