Auto to manual Query/Starter motor

[Super Ace-K]

Alright lads, well as some of you know from another thread I posted been having trouble sometimes starting the car when its hot so gonna go get the starter motor looked at. Was just wondering would an S13 starter motor suit our cars with the stock CA18ET engine?

P.S while i'm on the topic of S13 parts onto S12. My S12 is auto atm but down the line will wanna get it converted to manual. Was just wondering what my options were? I.e will the gearbox from a CA18DET fit? What will I need to get? I'll be bringing it to a mechanic to get it done and he knows his S13's like the back of his hands but just curious to see what I can get.

And advice would be appreciated, cheers lads.