they will work fine..   you can bolt them right onto the rear  without any
spacer.

In a message dated 12/30/2012 2:12:13 A.M. Eastern Standard Time,
sailingfc@DSLEXTREME.COM writes:

I have  an opportunity to get (4) wheels off my friend's Audi 2003  A6
Quattro.  They are 16x7, ET45.  I have tried them on the front  and they fit
with a spacer.  I did not have a chance to try them on  the rear yet.

http://tinyurl.com/bnpzkoa

Does anyone see a  problem with this?  I see that the original alloys have a
"LT" (light  truck?) designation on them.  Will the Audi wheels be  strong
enough?

If this works, I plan on buying 215/65x15 tires. This  combination will give
me an overall diameter pretty close to the 27x8.50-14  tires that I have
right now, which is giving me correct speedo numbers  (checked using a GPS).

Thanks.