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When you go to get the new belt, take the old one with you, it has the part number stamped on it and this will aid you in obtaining another one.
The belt is wrapped around the drum on the black mark where the old one was sitting. A loop od the leftover belt is then formed at the base of the cabinet, near the motor. The loop goes around the motor pulley and then over the idler pulley and then the motor is sprung down, using the spring on the motor and links to the base of the motor bracket,,,
If you accept my answer, I will take the back of one at our shop and post you a picture okay,