Traxxas Slash motor choice question

OK Linc, but i've a lot of 32 pitch, 5mm bore pinion, so can i run a 58T Jato 32 pitch spur, and go with a Medusa 50mm??
Is the motor will fit the stock tranny and i can mesh it properly?

Thank you

Ho just another think, is the Medusa 50mm motor is about the same diameter as the Feigao 12s?
And if i take a Feigao, sould i take the "s" can or the "L" can??