Congrats on your new beauty! I just bought my 15-91 from a thrift and it has the 'wrong' case and pedal for it. LOL It has a trapezoid case. It took me a bit to clean up the motor to keep it from smoking but she runs strong and I am happy. It's so cool you got the whole kit and caboodle. You're aunt would be happy to know her beloved machine is being used.