The data plate should be on the back edge of the driver door.
Example from one of my trucks, manufactured in Canada, the serial number (circled) is what I used when registering the vehicle:
From my older truck, it only had chassis serial number:
The truck model (L130) and chassis serial number should also be stamped on the outside vertical edge of the frame, driver side, about six inches back from the front hanger of the front spring. May be very faint and hard to read, use a flashlight and penetrating oil. The model + chassis number stamped on the frame should match the info on the data plate.
Also, I am in Edmonton too! There are lots of IHC guys around locally, good resources for information and spare parts