Howey,
your parents must love you.
that is a pretty car, and fully loaded for its time, in USA it probably sold for close to $18,000 US Dollars in 1985, and was still inexpensive for the time as a "sports" sedan.
one of the finest and safest cars built; EVER.
(and this is coming from a diehard Chevrolet guy)
as far as parts, in America (I'm sure he will UPS mail to your location)
the least expensive, and most reliable is:
http://www.force5auto.com/
his name is Chris as well, and he even called me back long distance, to get my credit card information, to insure the part was sent the same day. when I got my component, he had even marked down the price of it, to also cover the shipping!!!
his website post pictures of the vehicles he has for disassembly, so that you will even be able to see the conditions of interior and exterior parts.
he also has pictures of aftermarket rims and tires that will fit your car, but you can probably order something like that through local tire companies near you for much less.
also your exact model (only the quattro version) is the famed Audi that climbed the ski jump 25 years ago.
the commercial/video can be found at a couple of locations:
nordicaudi.com
and
http://www.25quattro.com/php/flash.php
if you need any thing else to assist you in putting it together, keeping it running, or performancing the heck out of her;
let us know.
hope this helps,
chris
nrt racing