Hi, this is not a 181 starter. 181 starter is the same as beetle auto-gearbox self supporting starter. But I´m using high torque european Magneton starter in my car. It is much stronger, lighter, also self supporting and is happily turning my engine. Its shape dictates the position in the car, the flange is in other position than with Bosch starter..
here you can see the difference in size and weight between the two:
can this be used on a 1600 bellhouse 091 gearbox.