Audi alloy front wishbones and subframe?

Hey all,

I have seen awhile ago that some on Facebook user groups seem to have fitted alloy lower arms and an alloy subframe from equivalent MQB chassis Audi's. Unfortunately I can't find the post and group for looking. 

I did fit Passat alloy arms on my MK6 Golf and it made a nice difference to the feeling of the handling.

Has anyone done this? If so do you have part numbers and any negatives to doing this? Did you use second hand or new parts?

Thanks in advance!