Got these at a steal off ebay, when they arrived I was a little disappointed at the state of them. stripped them down and cleaned them up along with a lick of paint. need help with a few things... what is the round thing that has corroded? and can anyone give me the part number? I also need the rigid pipe on the back and bracket. Last of all what are peoples opinions on either new S3 retainers or do I go VW R ones ?