1991 MotorGuide Electric Trolling Motor Models Where can I find my serial number? D45 [D] 9001157AD R21 [R] 9001180AD R28S [R] 9001183AD R33 [R] 9001192AD R45 [R] 9001196AD RL21 [RL] 9001181AD RL45 [RL] 9001197AD RX28S [RX] 9001185AD RX33 [RX] 9001194AD RX45 [RX] 9001198AD T21 [T] 9001120AD T33 [T] 9001122AD T45 [T] 9001126AD