If you do a search there is a thread that says what calipers you can use (I know mk.4 golf anni ones are a direct replacment thats why i used them but think also octavia VRS and Audi TT do but you may need a shim to get them to fit, You'd need to check this to be sure as im not 100%)
http://www.seatcupra.net/forums/showthread.php?p=1404317#post1404317