Shimano components compatibility! Pls Advice!

hoakin1981 Posts: 23
edited February 2011 in Workshop
Have a question about compatibility of various shimano components I have, whether I can use them together or not.

My components are:

Gear Levers : Ultegra - 6603
Front Der: 105 - 5703
Rear Der: Ultegra - 6703
Chain set: Ultegra - 6703

Would really appreciate any replies since the front der will be bought later today.

Many thanks in advance!