I use ebay to get missing parts. A few months ago I needed a 1959 Ford Galaxie dash to use with Jimmy Flintstone's 1959 Ford wagon so I bought a whole interior from a guy who broke up a vintage 1959 Ford Galaxie kit.
I finished building one last May. It builds into a nice model. The opening doors can be tricky. The hinge retainers kept coming off so I just glued the doors shut. Also the engine colors on the instruction sheet are incorrect. The engine should be painted Ford blue, the air cleaner white and the valve covers gloss black.