rebuild

JB420 made for UK market Getting a drivetrain noise that I think is a faulty output shaft bearing. So it's probably time for a transmission rebuild. Question is though, is the VIT5 rebuild kit (ZMBK293BWS) I see round the internet the right one for my transmission? I see multiple sites saying it...

So considering the fuel price of E10 is cheap in Australia where I am, I am considering buying an old worn out M15A engine and rebuild it to suit Ethanol type fuels as a home project. Has this been done before? Is this possible? Or can these engines already handle E10?