in the uk, aps and amd technik do the rs4/6 to d2 s8 kits but probably won't sell the brackets alone.
but the 3 best audi brake specialists are in germany (of course).
http://www.rs4-bremstechnik.de/ -ebay.de proparts24_de
http://www.urquattro.net/ ebay.de ur1980
http://www.ultimot.net/ -ebay.de ultimot-berlin
they all have ebay.de shops and all do a d2 s8 kit. my favorite is the rs6 c6 390mm kit for our s8's.
or if you just want to ogle all the awesome kits just go to ebay.de and search (audi bremse) and then sortieren nach - preis hochster zuerst (sort-high price first). or here
http://shop.ebay.de/i.html?_trkparms...4&_sop=3&_sc=1
you'll have to call them about selling brackets, or get chris or oli to sprach deutsch. chris already dealt with them. john