I have a '66 Convertible that no longer has the door plate. I am trying to determine an approximate build date from the VIN number. The last six digits of the VIN are 115109 - I believe this number was handed out sequentially when the car was built. I am looking for other '66 Mustangs that have a similar range VIN that still have the door plate containing the Build date. Any body have a number close to 115109??