Help! Alloy wheel size.

[Scraphead]

Hi guys. 
I’ve got an a3 s line, 2012 plate. 
Just looking at purchasing some 19” alloys, will they fit? 
the specs are: size 19 x 8.5, offset +40, 

or should I stick to 18”

thanks. 

[audia4b5kev]

5x112