* Dashboard: Check the area under the dash, often on the driver's side. It might be stamped on the metal.
* Firewall: The firewall (the metal partition between the engine compartment and passenger compartment) is another common location. Look closely for stamped numbers.
* Driver's side doorjamb: While less common on 1955 models, it's worth a quick check.
* Frame: The frame itself might have a partial or full serial number stamped on it. This is often difficult to access and requires some searching.
Important Note: The numbers you find won't be a 17-character VIN like modern cars. It will be a shorter serial number that, along with other information (like the body number and engine number), allows identification of the specific vehicle. You'll likely need to use this information along with the build date to trace the vehicle's history through Ford's historical records (if they still exist) or through resources dedicated to classic car identification.