Sorry, I can't answer your question but I am curious as to why do you want a bigger starter motor? Surely the 0.8KW starter motor is man enough for the job of starting the 1.3 engine. If you fit a 1.2 or 1.6KW starter motor you'll need a bigger battery to supply the extra cranking current and then strictly speaking you'll need a bigger alternator to charge the bigger battery. Possibly also need new wiring to take the extra current from the battery to the starter motor.
I am looking for a 1.0kw from a 1.6 ohv if compatible or maximum a 1.2 kw for easier engine starting during cold days.I already have a higher cranking battery