The Ultrega 10 speed tension pulley is actually the same as a 9speed XT, but I'm not sure about the Jockey pulley. Regardless, this is what you want..http://www.artscyclery.com/Shimano_6...-SH772DPS.html

BTW, your XT rear derailleur is an RD-M771; the CS-M771 is the cassette..