Audi A6 2005 - downgrading to 16" wheels

[Vaud]

I have an A6 3.0tdi and want to downgrade the wheels from 17" to 16".

Rim 7x16 ET45 / Bolt 5x112

Is this correct? Any specs I am missing?

Can anyone recommend a good reliable source of Audi wheels (I don't mind used refurbished)...

Many thanks