CGT88

Hi, I am new to the forum and also to Audi ownership! I have bought a 1988 Coupe GT 1.8, and am searching for some parts. Could anybody direct me to a good source for parts for this car, and also does anybody know, which other cars shared the brake calipers on mine. This is because I am either in need of a new Brake Carrier and Guide Pin, or a whole new kit of caliper and mounting. Any advice would be very greatfully received. The caliper is a Girling, and is the front O/S. Thanks