If you have a housing stamped 45251, they you probably have the Truth Window Operator Wi1532 or Truth Window Operator Wi1531. The Wi1531 has a 9-1/2″ long arm, and the Wi1532 has a 13-1/2″ long arm. The Wi1532 is shown below. The number on the crank is just a casting number but is usually found on the Wi1532 Operator or Wi1531.
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The two operators with the number 45251 stamped on the housing are:
9-1/2″: Truth Operator 9-1/2″ Arm
13-1/2″: Truth Operator 13-1/2″ Arm
Greg
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