2003 Audi A4 Automatic gearbox problem

Transmission problem
2003 Audi A4 4 cyl Two Wheel Drive Automatic

Hi,
My name is George Metaxas from Cyprus. Few days ago I asked you some question regarding my car's automatic transmission. I tried to replace it with a used one but unfortunately I cannot find one. I am wondering if is possible to replace the automatic one with manual transmission and what parts I will need to do the whole subject. What do you thing about that and what kind of manual gearbox is ok for my car:
Audi A4 1800cc Turbo
Automatic CVT tip (transm. Code: GEB xxx)
Year of manufacture 2002 registered 2003
Chassis No: WAUZZZ8E73A271716
Engine No: BFB 017053