Yeah I posted that info about the arbor with the picture :/
you need 40/13 front bevel gear for 1.63CS and the long arbor for front motor or short arbor for rear motor and 42/11 for 2.02CS
OK thank you all. The arbor thing is clear now for me. Since I plan to order the FM version I will only need the long arbor no matter the cs ratio I will run.