1940 Ford has Lockheed brakes. Long shoes goes on the front. Short shoe goes on the rear of each wheel. Larger dia. of wheel cylinder faces the long shoe. This is true of all 4 wheels. Bendix brakes are just the opposite.
Second photo is of the rear driver side wheel. Last photo is of the driver side front wheel.
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Possibly worth mentioning that the short shoe goes to the smaller diameter end of the cylinder. Both the smaller dimensions go to the rear. (shoe length and cylinder diameter).