I only have a burnt copy of the Boulez disc that does contain the Webern symphony. It's a cool program though. It also contains the Variations, as well as Webern's two lovely Cantatas. And let me tell you, you haven't lived until you've listened to fully adult choirs sing 12-tone melodies. Pop radio should be full of them. Anyway, here's the program:
Five Pcs. For Orch., op. 10; Three Orchestral Songs (these are beauties); Symphony, op. 21; Das Augenlicht, op. 26; Cantata #1; Variations For Orchestra, op. 30; Cantata #2, op. 31