There is no timing belt, there's timing chains. Yes, you need all 2.5L timing components. Be sure to read up on any FAQ's you can find, the NECO boards have a good one.
Timing components include:
chains
tentioners
guides
crank sprockets
of course cams.
Once you get all those components, then the timing marks line right up, and the new chains even have a color coded chain link for each spot to line up on.
