Hello from SD, 65 Fish and 76 Dart Sport

I'm a tad confused on the VIN number of the car, the production number is listed on the vin as the last 6 digits of the VIN number, but only 65,000 of them roughly were to have been made, wouldn't the production number be 5 digits then instead of 6 digits (mine is showing 218599 as the production number)