Gearbox replacement question

[TDI]

After a used gearbox for a A3 TDI. anyone know if the golf ones fit, as some of the bits from a vw fit audis like the golf turbo calipers and disc or the wheels. What should i look out for when buying a used gearbox? currently have a five speed, would i be able to upgrade to a six speed box?

Cheers

 

[S3Steve]

Should do, me and my mate fitted a Golf GTI gearbox to his A3 1.8T when he broke first gear on his original gearbox.