What are the differences between U.S. spec cars and Canadian spec cars?

There are not many differences. Canadian cars never had the automatic seatbelts ("mouse belts") present in earlier USA DSMs. Also, U.S. cars lack the daylight running light (DRL) system of the Canadian cars. Canadian cars also have metric instrumentation, including km/hr (speedometer), km (odometer) and kg/m3 ('boost' gauge). Canadian cars also have a 90A alternator, as opposed to the U.S. spec 75A.