http://www.nba.com/playerfile/trevor_ariza/ http://www.draftexpress.com/profile/Trevor-Ariza-1527/ Ariza was measured at 6'7"(without shoes), 6'8.25"(with shoes). The NBA lists shoe height.
I doubt the Spurs would let him go. They basically traded their bench in the Jefferson trade and having a good bench is essential in winning the title. Unless a trade comes up that would net them players that would strengthen their bench production then the Spurs are sticking to him.