Vittoria EVO CX valve stem ? for disc

I am a tubie newbie so this is a learning process for me. I have done a lot of searches and recieved some valuable info. I ordered my new tubes (Vittoria EVO CX 650c ) yesterday. My front tire is Zipp 404 so I knew I needed a longer removable red valve extender so I purchased a set. My question is will I need a shorter valve extender for my disc (Zipp 900). I believe the vittorias will come with a 42mm valve.