56 custom line vin numbers?

I have VIN number for a 56 ford custom that comes as invalid where can I go to solve it. It came off of the door panel.

It's unclear what your question is. ViNs weren't standardized in the current 17-character alphanumeric form until 1981. Before that, they could have ten or eleven digits (or even fewer for very early or low-volume marques). I've not heard of the VIN ever being on a "door panel" - doors can easily be replaced, so wouldn't be much use to be there.